Rainbow-electronics AT90S2313 Bedienungsanleitung PDF herunterladen (Seite 70)

AT90S2313

0839I–AVR–06/02

Data Polling Flash When a byte is being programmed into the Flash, reading the address location being

programmed will give the value $7F. At the time the device is ready for a new byte, the

programmed value will read correctly. This is used to determine when the next byte can

be written. This will not work for the value $7F, so when programming this value, the

user will have to wait for at least t

WD_PROG

before programming the next byte. As a chip-

erased device contains $FF in all locations, programming of addresses that are meant

to contain $FF can be skipped.

Figure 54. Serial Programming Waveforms

Note: a = address high bits, b = address low bits, H =0– Low byte, 1 – High Byte, o = data out, i = data in, x = don’t care,

= Lock bit

= Lock bit 2.

Note: 1. The signature bytes are not readable in lock mode 3, i.e. both Lock bits programmed.

Table 2 8. Serial Programming Instruction Set

Instruction

Instruction Format

OperationByte 1 Byte 2 Byte 3 Byte4

Programming Enable

1010 1100 0101 0011 xxxx xxxx xxxx xxxx Enable serial programming while

RESET

is low.

Chip Erase

1010 1100 100x xxxx xxxx xxxx xxxx xxxx Chip erase Flash and EEPROM

memory arrays.

Read Program Memory

0010 H000 xxxx xxaa bbbb bbbb oooo oooo Read H (highorlow)datao from

program memory at word address

a:b.

Write Program Memory

0100 H000 xxxx xxaa bbbb bbbb iiii iiii Write H (high or low) data i to

program memory at word address

a:b.

Read EEPROM

Memory

1010 0000 xxxx xxxx xbbb bbbb oooo oooo Read data o from EEPROM memory

at address b.

Write EEPROM

Memory

1100 0000 xxxx xxxx xbbb bbbb iiii iiii Write data i to EEPROM memory at

address b.

Write Lock Bits

1010 1100 111x x

x xxxx xxxx xxxx xxxx Write Lock bits. Set bits

1,2

= “0” to

program Lock bits.

Read Signature Bytes 0011 0000 xxxx xxxx xxxx xxbb oooo oooo Read signature byte o at address b.

(1)

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 91 92

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