PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

3.8

Protection Against Spurious Write

3.9

Operation During Code-Protect

There are conditions when the device should not write

to the data EEPROM memory. To protect against spu-

rious EEPROM writes, various mechanisms have been

built-in. On power-up, WREN is cleared. Also, the

Power-up Timer (72 ms duration) prevents an

EEPROM write.

The write initiate sequence and the WREN bit together

help prevent an accidental write during brown-out,

power glitch or software malfunction.

When the data EEPROM is code-protected, the micro-

controller can read and write to the EEPROM normally.

However, all external access to the EEPROM is

disabled. External write access to the program memory

is also disabled.

When program memory is code-protected, the microcon-

troller can read and write to program memory normally as

well as execute instructions. Writes by the device may be

selectively inhibited to regions of the memory depending

on the setting of bits, WRT1:WRT0, of the Configuration

Word (see

Section 12.1 鈥淐onfiguration Bits鈥?/span>

for addi-

tional information). External access to the memory is also

disabled.

TABLE 3-1:

REGISTERS/BITS ASSOCIATED WITH DATA EEPROM AND

FLASH PROGRAM MEMORIES

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

Address

10Ch

10Dh

10Eh

10Fh

18Ch

18Dh

0Dh

8Dh

Legend:

Name

EEDATA EEPROM/Flash Data Register Low Byte

EEADR

EEDATH

EEADRH

EEPROM/Flash Address Register Low Byte

鈥?/div>

EEPROM/Flash Data Register High Byte

鈥?/div>

FREE

EEIF

EEIE

鈥?/div>

WRERR

鈥?/div>

EEPROM/Flash Address

WREN

鈥?/div>

xxxx xxxx uuuu uuuu

--xx xxxx --uu uuuu

---- -xxx ---- -uuu

x--x x000 x--x q000

---- ---- ---- ----

---0 ---- ---0 ----

EECON1 EEPGD

PIR2

PIE2

鈥?/div>

EECON2 EEPROM Control Register 2 (not a physical register)

= unknown,

= unchanged,

= unimplemented, read as 鈥?鈥?

= value depends upon condition.

Shaded cells are not used by data EEPROM or Flash program memory.

DS39598D-page 32

Preliminary

铮?/div>

2003 Microchip Technology Inc.

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