Rainbow Electronics AT90S8515 - Manual (Page 88)

88
AT90S8515
0841G–09/01
Figure 65. Serial Programming Waveforms
Note: 1. The signature bytes are not readable in lock mode 3, i.e., both Lock bits programmed.
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
1 = Lock bit 1
2 = Lock bit 2
Table 32. Serial Programming Instruction Set
Instruction
Instruction Format
Operation Byte 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 aaaa bbbb bbbb oooo oooo Read H (high or low) data o from
program memory at word address a:b.
Write Program Memory
0100 H000 xxxx aaaa 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 xxxa bbbb bbbb oooo oooo Read data o from EEPROM memory at
address a:b.
Write EEPROM Memory
1100 0000 xxxx xxxa bbbb bbbb iiii iiii Write data i to EEPROM memory at
address a:b.
Write Lock Bits
1010 1100 111x x21x 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)