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參數(shù)資料
| 型號(hào)： | PIC16F877-20I/L |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 158/218頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU FLASH 8KX14 EE 44PLCC |
| 產(chǎn)品培訓(xùn)模塊： | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 系列： | PIC® 16F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 33 |
| 程序存儲(chǔ)器容量： | 14KB（8K x 14） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大小： | 256 x 8 |
| RAM 容量： | 368 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 管件 |
| 配用： | AC164309-ND - MODULE SKT FOR PM3 44PLCC 444-1001-ND - DEMO BOARD FOR PICMICRO MCU 309-1040-ND - ADAPTER 44-PLCC ZIF TO 40-DIP 309-1039-ND - ADAPTER 44-PLCC TO 40-DIP |
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PIC16F87X
DS30292C-page 42
2001 Microchip Technology Inc.
Write operations have two control bits, WR and WREN,
and two status bits, WRERR and EEIF. The WREN bit
is used to enable or disable the write operation. When
WREN is clear, the write operation will be disabled.
Therefore, the WREN bit must be set before executing
a write operation. The WR bit is used to initiate the write
operation. It also is automatically cleared at the end of
the write operation. The interrupt flag EEIF is used to
determine when the memory write completes. This flag
must be cleared in software before setting the WR bit.
For EEPROM data memory, once the WREN bit and
the WR bit have been set, the desired memory address
in EEADR will be erased, followed by a write of the data
in EEDATA. This operation takes place in parallel with
the microcontroller continuing to execute normally.
When the write is complete, the EEIF flag bit will be set.
For program memory, once the WREN bit and the WR
bit have been set, the microcontroller will cease to exe-
cute instructions. The desired memory location pointed
to by EEADRH:EEADR will be erased. Then, the data
value in EEDATH:EEDATA will be programmed. When
complete, the EEIF flag bit will be set and the microcon-
troller will continue to execute code.
The WRERR bit is used to indicate when the
PIC16F87X device has been reset during a write oper-
ation. WRERR should be cleared after Power-on
Reset. Thereafter, it should be checked on any other
RESET. The WRERR bit is set when a write operation
is interrupted by a MCLR Reset, or a WDT Time-out
Reset, during normal operation. In these situations, fol-
lowing a RESET, the user should check the WRERR bit
and rewrite the memory location, if set. The contents of
the data registers, address registers and EEPGD bit
are not affected by either MCLR Reset, or WDT Time-
out Reset, during normal operation.
REGISTER 4-1:
EECON1 REGISTER (ADDRESS 18Ch)
R/W-x
U-0
R/W-x
R/W-0
R/S-0
EEPGD
—
WRERR
WREN
WR
RD
bit 7
bit 0
bit 7
EEPGD: Program/Data EEPROM Select bit
1
= Accesses program memory
0
= Accesses data memory
(This bit cannot be changed while a read or write operation is in progress)
bit 6-4
Unimplemented: Read as '0'
bit 3
WRERR: EEPROM Error Flag bit
1
= A write operation is prematurely terminated
(any MCLR Reset or any WDT Reset during normal operation)
0
= The write operation completed
bit 2
WREN: EEPROM Write Enable bit
1
= Allows write cycles
0
= Inhibits write to the EEPROM
bit 1
WR: Write Control bit
1
= Initiates a write cycle. (The bit is cleared by hardware once write is complete. The WR bit
can only be set (not cleared) in software.)
0
= Write cycle to the EEPROM is complete
bit 0
RD: Read Control bit
1
= Initiates an EEPROM read. (RD is cleared in hardware. The RD bit can only be set (not
cleared) in software.)
0
= Does not initiate an EEPROM read
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
’1’ = Bit is set
’0’ = Bit is cleared
x = Bit is unknown
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