PIC18F4550-I/P Microchip Technology Inc., PIC18F4550-I/P Datasheet - Page 177
![no-image](/images/manufacturer_photos/0/4/440/microchip_technology_inc__sml.jpg)
PIC18F4550-I/P
Manufacturer Part Number
PIC18F4550-I/P
Description
40 PIN, 32 KB FLASH, 2048 RAM, FS-USB 2.0
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4550-IP.pdf
(430 pages)
Specifications of PIC18F4550-I/P
A/d Inputs
13-Channel, 10-Bit
Comparators
2
Cpu Speed
12 MIPS
Eeprom Memory
256 Bytes
Input Output
34
Interface
I2C/SPI/UART/USART/USB
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
32K Bytes
Ram Size
2K Bytes
Speed
48 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F4550-I/PT
Manufacturer:
MURATA
Quantity:
12 000
Company:
Part Number:
PIC18F4550-I/PT
Manufacturer:
Microchip Technology
Quantity:
36 332
Company:
Part Number:
PIC18F4550-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC18F4550-I/PT
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- Current page: 177 of 430
- Download datasheet (8Mb)
17.4.4
An endpoint is defined to have a ping-pong buffer when
it has two sets of BD entries: one set for an Even
transfer and one set for an Odd transfer. This allows the
CPU to process one BD while the SIE is processing the
other BD. Double-buffering BDs in this way allows for
maximum throughput to/from the USB.
The USB module supports four modes of operation:
• No ping-pong support
• Ping-pong buffer support for OUT Endpoint 0 only
• Ping-pong buffer support for all endpoints
• Ping-pong buffer support for all other Endpoints
The ping-pong buffer settings are configured using the
PPB1:PPB0 bits in the UCFG register.
The USB module keeps track of the Ping-Pong Pointer
individually for each endpoint. All pointers are initially
reset to the Even BD when the module is enabled. After
FIGURE 17-7:
© 2006 Microchip Technology Inc.
400h
47Fh
4FFh
except Endpoint 0
Note:
Maximum Memory
Used: 128 bytes
Maximum BDs:
32 (BD0 to BD31)
PPB1:PPB0 = 00
No Ping-Pong
Data RAM
Available
Buffers
as
PING-PONG BUFFERING
Memory area not shown to scale.
EP0 OUT
Descriptor
EP0 IN
Descriptor
EP1 OUT
Descriptor
EP1 IN
Descriptor
EP15 IN
Descriptor
BUFFER DESCRIPTOR TABLE MAPPING FOR BUFFERING MODES
4FFh
400h
483h
Ping-Pong Buffer
PPB1:PPB0 = 01
Maximum Memory
Used: 132 bytes
Maximum BDs:
33 (BD0 to BD32)
on EP0 OUT
Data RAM
Available
as
EP0 OUT Even
Descriptor
EP0 OUT Odd
Descriptor
EP0 IN
Descriptor
EP1 OUT
Descriptor
EP1 IN
Descriptor
EP15 IN
Descriptor
PIC18F2455/2550/4455/4550
Preliminary
4FFh
400h
Ping-Pong Buffers
Maximum Memory
Used: 256 bytes
Maximum BDs: 6
4 (BD0 to BD63)
PPB1:PPB0 = 10
on all EPs
the completion of a transaction (UOWN cleared by the
SIE), the pointer is toggled to the Odd BD. After the
completion of the next transaction, the pointer is
toggled back to the Even BD and so on.
The Even/Odd status of the last transaction is stored in
the PPBI bit of the USTAT register. The user can reset
all Ping-Pong Pointers to Even using the PPBRST bit.
Figure 17-7 shows the four different modes of
operation and how USB RAM is filled with the BDs.
BDs have a fixed relationship to a particular endpoint,
depending on the buffering configuration. The mapping
of BDs to endpoints is detailed in Table 17-4. This
relationship also means that gaps may occur in the
BDT if endpoints are not enabled contiguously. This
theoretically means that the BDs for disabled endpoints
could be used as buffer space. In practice, users
should avoid using such spaces in the BDT unless a
method of validating BD addresses is implemented.
EP0 OUT Even
Descriptor
EP0 OUT Odd
Descriptor
EP0 IN Even
Descriptor
EP0 IN Odd
Descriptor
EP1 OUT Even
Descriptor
EP1 OUT Odd
Descriptor
EP1 IN Even
Descriptor
EP1 IN Odd
Descriptor
EP15 IN Odd
Descriptor
4F7h
4FFh
400h
Ping-Pong Buffers
Maximum Memory
Used: 248 bytes
Maximum BDs:
62 (BD0 to BD61)
PPB1:PPB0 = 11
on all other EPs
Data RAM
Available
except EP0
as
DS39632C-page 175
EP0 OUT
Descriptor
EP0 IN
Descriptor
EP1 OUT Even
Descriptor
EP1 OUT Odd
Descriptor
EP1 IN Odd
Descriptor
EP15 IN Odd
Descriptor
EP1 IN Even
Descriptor
Related parts for PIC18F4550-I/P
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![PIC18F-LF1XK50](/images/no-image3.png)
Part Number:
Description:
20-Pin USB Flash Microcontrollers
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC18F6393T-I/PT](/photos/6/81/68123/c04-066_pf_tmb.jpg)
Part Number:
Description:
PIC18F With 128-segment LCD Driver And 12-bit ADC, 8KB Flash, 768B RAM, CCP, MSS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F6493T-I/PT](/photos/6/81/68123/c04-066_pf_tmb.jpg)
Part Number:
Description:
PIC18F With 128-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F8393T-I/PT](/images/manufacturer_photos/0/4/439/microchip_technology_tmb.jpg)
Part Number:
Description:
PIC18F With 192-segment LCD Driver And 12-bit ADC, 8KB Flash, 768B RAM, CCP, MSS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F8493T-I/PT](/images/manufacturer_photos/0/4/439/microchip_technology_tmb.jpg)
Part Number:
Description:
PIC18F With 192-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F6585-I/L](/photos/16/12/161282/68-plcc-large-300dpi-lyrd_tmb.jpg)
Part Number:
Description:
Microcontrollers (MCU) 48KB 3328 RAM 52 I/O
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F6680-I/L](/photos/16/12/161282/68-plcc-large-300dpi-lyrd_tmb.jpg)
Part Number:
Description:
Microcontrollers (MCU) 64KB 3328 RAM 52 I/O
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90T-I/MR](/photos/16/3/160368/qfn64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 QFN 9x9x0.9mm T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90T-I/PT](/photos/16/3/160367/tqfp-64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F87K90T-I/PT](/photos/40/31/403173/tqfp-80_tmb.jpg)
Part Number:
Description:
128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm T/
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90-I/MR](/photos/16/3/160368/qfn64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 QFN 9x9x0.9mm TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90-I/PT](/photos/16/3/160367/tqfp-64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm TRAY
Manufacturer:
Microchip Technology
![PIC18F87K90-I/PT](/photos/40/31/403173/tqfp-80_tmb.jpg)
Part Number:
Description:
128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm TR
Manufacturer:
Microchip Technology