PIC16F87T-I/ML【PDF 117/200 页】IC MCU FLASH 4KX14 EEPROM 28QFN

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203

8008H–AVR–04/11

ATtiny48/88

Table 21-9). In a chip erased device, no 0xFFs in the data file(s) need to be

programmed.

– B: The EEPROM array is programmed one page at a time. The Memory page is

loaded one byte at a time by supplying the 6 LSB of the address and data together

with the Load EEPROM Memory Page instruction. The EEPROM Memory Page is

stored by loading the Write EEPROM Memory Page Instruction with the 7 MSB of

the address. When using EEPROM page access only byte locations loaded with the

Load EEPROM Memory Page instruction is altered. The remaining locations remain

unchanged. If polling (RDY/BSY) is not used, the used must wait at least t

WD_EEPROM

before issuing the next byte (See Table 21-9). In a chip erased device, no 0xFF in

the data file(s) need to be programmed.

Any memory location can be verified by using the Read instruction which returns the

content at the selected address at serial output MISO.

At the end of the programming session, RESET can be set high to commence normal

operation.

Power-off sequence (if needed): Set RESET to “1”. Turn V

CC power off.

21.3.3

Programming Instruction set

Table 21-8 on page 203 and Figure 21-8 on page 204 describes the Instruction set.

Table 21-8.

Serial Programming Instruction Set (Hexadecimal values)

Instruction/Operation

Instruction Format

Byte 1

Byte 2

Byte 3

Byte4

Programming Enable

$AC

$53

$00

Chip Erase (Program Memory/EEPROM)

$AC

$80

$00

Poll RDY/BSY

$F0

$00

data byte out

Load Instructions

Load Extended Address byte(1)

$4D

$00

Extended adr

$00

Load Program Memory Page, High byte

$48

$00

adr LSB

high data byte in

Load Program Memory Page, Low byte

$40

$00

adr LSB

low data byte in

Load EEPROM Memory Page (page access)

$C1

$00

0000 000aa

data byte in

Read Instructions

Read Program Memory, High byte

$28

adr MSB

adr LSB

high data byte out

Read Program Memory, Low byte

$20

adr MSB

adr LSB

low data byte out

Read EEPROM Memory

$A0

0000 00aa

aaaa aaaa

data byte out

Read Lock bits

$58

$00

data byte out

Read Signature Byte

$30

$00

0000 000aa

data byte out

Read Fuse bits

$50

$00

data byte out

Read Fuse High bits

$58

$08

$00

data byte out

Read Fuse Extended Bits

$50

$08

$00

data byte out

Read Calibration Byte

$38

$00

data byte out

Write Instructions

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