PIC18LF2221-I/SP Microchip Technology, PIC18LF2221-I/SP Datasheet - Page 200
![IC PIC MCU FLASH 2KX16 28DIP](/photos/6/59/65908/150-28-dip_sml.jpg)
PIC18LF2221-I/SP
Manufacturer Part Number
PIC18LF2221-I/SP
Description
IC PIC MCU FLASH 2KX16 28DIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F2221-ISO.pdf
(402 pages)
2.PIC18F2221-ISO.pdf
(8 pages)
3.PIC18F2221-ISO.pdf
(30 pages)
4.PIC18F2221-ISO.pdf
(46 pages)
5.PIC18LF2221-IML.pdf
(394 pages)
6.PIC18F2321-IML.pdf
(396 pages)
Specifications of PIC18LF2221-I/SP
Core Size
8-Bit
Program Memory Size
4KB (2K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
25
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Controller Family/series
PIC18
No. Of I/o's
25
Eeprom Memory Size
256Byte
Ram Memory Size
512Byte
Cpu Speed
40MHz
No. Of Timers
4
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- PIC18F2221-ISO PDF datasheet
- PIC18F2221-ISO PDF datasheet #2
- PIC18F2221-ISO PDF datasheet #3
- PIC18F2221-ISO PDF datasheet #4
- PIC18LF2221-IML PDF datasheet #5
- PIC18F2321-IML PDF datasheet #6
- Current page: 200 of 402
- Download datasheet (7Mb)
PIC18F2221/2321/4221/4321 FAMILY
18.4.9
A Repeated Start condition occurs when the RSEN bit
(SSPCON2<1>) is programmed high and the I
module is in the Idle state. When the RSEN bit is set,
the SCL pin is asserted low. When the SCL pin is
sampled low, the Baud Rate Generator is loaded with
the contents of SSPADD<5:0> and begins counting.
The SDA pin is released (brought high) for one Baud
Rate Generator count (T
Generator times out, if SDA is sampled high, the SCL
pin will be deasserted (brought high). When SCL is
sampled high, the Baud Rate Generator is reloaded
with the contents of SSPADD<6:0> and begins count-
ing. SDA and SCL must be sampled high for one T
This action is then followed by assertion of the SDA pin
(SDA = 0) for one T
this, the RSEN bit (SSPCON2<1>) will be automatically
cleared and the Baud Rate Generator will not be
reloaded, leaving the SDA pin held low. As soon as a
Start condition is detected on the SDA and SCL pins,
the S bit (SSPSTAT<3>) will be set. The SSPIF bit will
not be set until the Baud Rate Generator has timed out.
FIGURE 18-22:
DS39689F-page 200
I
START CONDITION TIMING
2
C MASTER MODE REPEATED
on falling edge of ninth clock,
RSEN bit set by hardware
BRG
REPEATED START CONDITION WAVEFORM
SDA
SCL
while SCL is high. Following
BRG
). When the Baud Rate
end of Xmit
Write to SSPCON2
occurs here.
SDA = 1,
SCL (no change).
2
C logic
BRG
T
SDA = 1,
SCL = 1
.
BRG
T
BRG
Immediately following the SSPIF bit getting set, the user
may write the SSPBUF with the 7-bit address in 7-bit
mode, or the default first address in 10-bit mode. After
the first eight bits are transmitted and an ACK is
received, the user may then transmit an additional eight
bits of address (10-bit mode) or eight bits of data (7-bit
mode).
18.4.9.1
If the user writes the SSPBUF when a Repeated Start
sequence is in progress, the WCOL is set and the
contents of the buffer are unchanged (the write doesn’t
occur).
Note:
Note 1: If RSEN is programmed while any other
Sr = Repeated Start
T
BRG
2: A bus collision during the Repeated Start
S bit set by hardware
At completion of Start bit,
hardware clears RSEN bit
and sets SSPIF
Because queueing of events is not
allowed, writing of the lower 5 bits of
SSPCON2 is disabled until the Repeated
Start condition is complete.
Write to SSPBUF occurs here
event is in progress, it will not take effect.
condition occurs if:
• SDA is sampled low when SCL goes
• SCL goes low before SDA is
WCOL Status Flag
T
from low-to-high.
asserted low. This may indicate that
another master is attempting to
transmit a data ‘1’.
BRG
1st bit
T
BRG
© 2009 Microchip Technology Inc.
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