PIC18F6621-I/PT Microchip Technology, PIC18F6621-I/PT Datasheet - Page 2

• Manufacturer Part Number: PIC18F6621-I/PT
• Description: IC PIC MCU FLASH 32KX16 64TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F6621-I/PT

• Core Size: 8-Bit
• Program Memory Size: 64KB (32K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 3.75K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Controller Family/series: PIC18
• No. Of I/o's: 53
• Eeprom Memory Size: 1024Byte
• Ram Memory Size: 3.75KB
• Cpu Speed: 40MHz
• No. Of Timers: 5
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3840 B
• Interface Type: MSSP, SPI, I2C, EUSART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 53
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136, DM183032
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 12 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT64PT5 - SOCKET TRAN ICE 64MQFP/TQFPAC164319 - MODULE SKT MPLAB PM3 64TQFPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Lead Free Status / Rohs Status: Details

PIC18F6525/6621/8525/8621
6. Module: Core (Instruction Set)
EXAMPLE 1:
7. Module: External Memory Bus
DS80163D-page 2
The Decimal Adjust W register instruction, DAW,
may improperly clear the Carry bit (STATUS<0>)
when executed.
Work around
Test the Carry bit state before executing the DAW
instruction. If the Carry bit is set, increment the
next higher byte to be added using an instruction
such as INCFSZ (this instruction does not affect
any Status flags and will not overflow a BCD
nibble). After the DAW instruction has been
executed, process the Carry bit normally (see
Example 1).
This is repeated for each DAW instruction.
When performing writes on the external memory
interface, a short glitch is present on the LB and
UB lines. The length of the glitch is proportional to
F
temperature. The glitch occurs well before the
WRH line is asserted and no adverse affect on the
operation of the external memory interface has
been observed.
Work around
None
MOVLW
ADDLW
BTFSC
INCFSZ byte2
DAW
BTFSC
INCFSZ byte2
OSC
and also may vary with process, voltage and
0x80
0x80
STATUS, C
STATUS, C
PROCESSING THE CARRY
BIT DURING BCD ADDITIONS
; .80 (BCD)
; .80 (BCD)
; test C
; inc next higher LSB
; test C
; inc next higher LSB
8. Module: EUSART
9. Module: EUSART
10. Module: EUSART
11. Module: EUSART
Bit SENDB in the TXSTAx register is not automat-
ically cleared by hardware upon completion of
transmission of a Sync Break.
Work around
Check the TRMT bit in TXSTAx. If TRMT bit is set,
Break transmission is said to be complete.
Writing to the USART/EUSART TXREGx, faster
than the baud rate in Synchronous mode, will
overwrite the previous value instead of
double-buffering as in Asynchronous mode.
Work around
Load the first character into TXREGx and then wait
for a TXx interrupt, or check the TXxIF bit before
writing each additional character to TXREGx.
The EUSART cannot receive asynchronous data at
the four fastest baud rates (BRGH = 1, BRG16 = 1
and SPBRGx < 4).
Work around
Use a slower baud rate or a faster system clock
speed.
The EUSART for PIC18F8525/8621 devices may
not recognize a received Stop bit if the combined
error rate is too high.
Work around
1. Increase the baud rate of the device by
2. Configure the transmitter to send two Stop bits.
decrementing the SPBRGHx:SPBRGx register
pair value by one. Verify that the new baud rate
does not exceed the maximum combined error
rate of the application.
© 2006 Microchip Technology Inc.