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PIC16LF877-04I/PT
PIC16LF877-04I/PT | |
|---|---|
| Manufacturer Part Number | PIC16LF877-04I/PT |
| Description | IC PIC MCU FLASH 8KX14 44TQFP |
| Manufacturer | Microchip Technology |
| Series | PIC® 16F |
| PIC16LF877-04I/PT datasheets |
|
Availability: In stock
International delivery:
Warranty: 60 days
×
- We provide standard 60-days warranty for all parts. If warranty differs we always mention it beforehand. In case of return we cover shipping costs.
- If you still have any questions - please contact us
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Specifications of PIC16LF877-04I/PT | |||
|---|---|---|---|
| Core Size | 8-Bit | Program Memory Size | 14KB (8K x 14) |
| Core Processor | PIC | Speed | 4MHz |
| Connectivity | I²C, SPI, UART/USART | Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Number Of I /o | 33 | Program Memory Type | FLASH |
| Eeprom Size | 256 x 8 | Ram Size | 368 x 8 |
| Voltage - Supply (vcc/vdd) | 2 V ~ 5.5 V | Data Converters | A/D 8x10b |
| Oscillator Type | External | Operating Temperature | -40°C ~ 85°C |
| Package / Case | 44-TQFP, 44-VQFP | Controller Family/series | PIC16LF |
| No. Of I/o's | 33 | Eeprom Memory Size | 256Byte |
| Ram Memory Size | 368Byte | Cpu Speed | 4MHz |
| No. Of Timers | 3 | Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
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PrevNext
At the completion of the write cycle, the WR bit is
cleared and the EEIF interrupt flag bit is set. (EEIF
must be cleared by firmware.) Since the microcontroller
does not execute instructions during the write cycle, the
firmware does not necessarily have to check either
EEIF, or WR, to determine if the write had finished.
EXAMPLE 4-4:
FLASH PROGRAM WRITE
BSF
STATUS, RP1
;
BCF
STATUS, RP0
;Bank 2
MOVF
ADDRL, W
;Write address
MOVWF
EEADR
;of desired
MOVF
ADDRH, W
;program memory
MOVWF
EEADRH
;location
MOVF
VALUEL, W
;Write value to
MOVWF
EEDATA
;program at
MOVF
VALUEH, W
;desired memory
MOVWF
EEDATH
;location
BSF
STATUS, RP0
;Bank 3
BSF
EECON1, EEPGD ;Point to Program memory
BSF
EECON1, WREN
;Enable writes
;Only disable interrupts
BCF
INTCON, GIE
;if already enabled,
;otherwise discard
MOVLW
0x55
;Write 55h to
MOVWF
EECON2
;EECON2
MOVLW
0xAA
;Write AAh to
MOVWF
EECON2
;EECON2
BSF
EECON1, WR
;Start write operation
NOP
;Two NOPs to allow micro
NOP
;to setup for write
;Only enable interrupts
BSF
INTCON, GIE
;if using interrupts,
;otherwise discard
BCF
EECON1, WREN
;Disable writes
4.6
Write Verify
The PIC16F87X devices do not automatically verify the
value written during a write operation. Depending on
the application, good programming practice may dic-
tate that the value written to memory be verified against
the original value. This should be used in applications
where excessive writes can stress bits near the speci-
fied endurance limits.
2001 Microchip Technology Inc.
PIC16F87X
4.7
Protection Against Spurious
Writes
There are conditions when the device may not want to
write to the EEPROM data memory or FLASH program
memory. To protect against these spurious write condi-
tions, various mechanisms have been built into the
PIC16F87X devices. On power-up, the WREN bit is
cleared and the Power-up Timer (if enabled) prevents
writes.
The write initiate sequence, and the WREN bit
together, help prevent any accidental writes during
brown-out, power glitches, or firmware malfunction.
4.8
Operation While Code Protected
The PIC16F87X devices have two code protect mecha-
nisms, one bit for EEPROM data memory and two bits for
FLASH program memory. Data can be read and written
to the EEPROM data memory, regardless of the state of
the code protection bit, CPD. When code protection is
enabled and CPD cleared, external access via ICSP is
disabled, regardless of the state of the program memory
code protect bits. This prevents the contents of EEPROM
data memory from being read out of the device.
The state of the program memory code protect bits,
CP0 and CP1, do not affect the execution of instruc-
tions out of program memory. The PIC16F87X devices
can always read the values in program memory,
regardless of the state of the code protect bits. How-
ever, the state of the code protect bits and the WRT bit
will have different effects on writing to program mem-
ory. Table 4-1 shows the effect of the code protect bits
and the WRT bit on program memory.
Once code protection has been enabled for either
EEPROM data memory or FLASH program memory,
only a full erase of the entire device will disable code
protection.
DS30292C-page 45
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