Rainbow-electronics ATmega8HVD Bedienungsanleitung PDF herunterladen (Seite 133)

133

8052B–AVR–09/08

ATmega4HVD/8HVD

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 page (See Table 24-9). In a chip erased device, no 0xFF in the

data file(s) need to be programmed.

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

content at the selected address at serial output MISO.

7. At the end of the programming session, RESET

can be set high to commence normal

operation.

8. Power-off sequence (if needed):

Set RESET

to “1”.

Tur n V

power off.

24.6.2 Serial Programming Instruction set

Table 24-10 on page 133 and Figure 24-2 on page 135 describes the Instruction set.

Table 24-9. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location

Symbol Minimum Wait Delay

WD_FLASH

4.5 ms

WD_EEPROM

4.0 ms

WD_ERASE

4.0 ms

WD_FUSE

4.5 ms

Table 24-10. Serial Programming Instruction Set

Instruction/Operation

Instruction Format

Byte 1 Byte 2 Byte 3 Byte4

Programming Enable $AC $53 $00 $00

Chip Erase (Program Memory/EEPROM) $AC $80 $00 $00

Poll RDY/BSY

$F0 $00 $00 data byte out

Load Instructions

Load Extended Address byte $4D $00 Extended adr $00

Load Program Memory Page, High byte $48 adr MSB adr LSB high data byte in

Load Program Memory Page, Low byte $40 adr MSB adr LSB low data byte in

Load EEPROM Memory Page (page access) $C1 $00 adr LSB 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 adr MSB adr LSB data byte out

Read Lock bits $58 $00 $00 data byte out

Read Signature Byte $30 $00 adr LSB data byte out

Read Fuse bits $50 $00 $00 data byte out

Read Fuse High bits $58 $08 $00 data byte out

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 167 168

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