参数资料
型号: PIC16F84-04I/P
厂商: Microchip Technology
文件页数: 29/80页
文件大小: 0K
描述: IC MCU FLASH 1KX14 EE 18DIP
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 25
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 13
程序存储器容量: 1.75KB(1K x 14)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 68 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 18-DIP(0.300",7.62mm)
包装: 管件
配用: DVA16XP180-ND - ADAPTER DEVICE FOR MPLAB-ICE
AC164010-ND - MODULE SKT PROMATEII DIP/SOIC
PIC16F8X
1998 Microchip Technology Inc.
DS30430C-page 35
7.5
Write Verify
Depending on the application, good programming prac-
tice may dictate that the value written to the Data
EEPROM should be verified (Example 7-1) to the
desired value to be written. This should be used in
applications where an EEPROM bit will be stressed
near the specification limit. The Total Endurance disk
will help determine your comfort level.
Generally the EEPROM write failure will be a bit which
was written as a ’1’, but reads back as a ’0’ (due to
leakage off the bit).
EXAMPLE 7-1:
WRITE VERIFY
BCF
STATUS, RP0 ; Bank 0
:
; Any code can go here
:
;
MOVF
EEDATA, W
; Must be in Bank 0
BSF
STATUS, RP0 ; Bank 1
READ
BSF
EECON1, RD
; YES, Read the
;
value written
BCF
STATUS, RP0 ; Bank 0
;
; Is the value written (in W reg) and
;
read (in EEDATA) the same?
;
SUBWF EEDATA, W
;
BTFSS STATUS, Z
; Is difference 0?
GOTO
WRITE_ERR
; NO, Write error
:
; YES, Good write
:
; Continue program
7.6
Protection Against Spurious Writes
There are conditions when the device may not want to
write to the data EEPROM memory. To protect against
spurious EEPROM writes, various mechanisms have
been built in. On power-up, WREN is cleared. Also, the
Power-up
Timer
(72
ms
duration)
prevents
EEPROM write.
The write initiate sequence and the WREN bit together
help prevent an accidental write during brown-out,
power glitch, or software malfunction.
7.7
Data EEPROM Operation during Code
Protect
When the device is code protected, the CPU is able to
read and write unscrambled data to the Data EEPROM.
For ROM devices, there are two code protection bits
(Section 8.1). One for the ROM program memory and
one for the Data EEPROM memory.
TABLE 7-1
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other resets
08h
EEDATA
EEPROM data register
xxxx xxxx
uuuu uuuu
09h
EEADR
EEPROM address register
xxxx xxxx
uuuu uuuu
88h
EECON1
EEIF
WRERR
WREN
WR
RD
---0 x000
---0 q000
89h
EECON2
EEPROM control register 2
---- ----
Legend: x = unknown, u = unchanged, - = unimplemented read as ’0’, q = value depends upon condition. Shaded cells are not
used by Data EEPROM.
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