Serial programming instruction set, Programming interface – parallel mode, At89ls51 – Rainbow Electronics AT89LS51 User Manual
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AT89LS51
3053A–8051–05/02
Power-off sequence (if needed):
Set XTAL1 to “L” (if a crystal is not used).
Set RST to “L”.
Turn V
CC
power off.
Data Polling: The Data Polling feature is also available in the serial mode. In this mode, dur-
ing a write cycle an attempted read of the last byte written will result in the complement of the
MSB of the serial output byte on MISO.
Serial
Programming
Instruction Set
The Instruction Set for Serial Programming follows a 4-byte protocol and is shown in Table 8.
Programming
Interface –
Parallel Mode
Every code byte in the Flash array can be programmed by using the appropriate combination
of control signals. The write operation cycle is self-timed and once initiated, will automatically
time itself to completion.
Most major worldwide programming vendors offer support for the Atmel microcontroller series.
Please contact your local programming vendor for the appropriate software revision.
Notes:
1. Each PROG pulse is 200 ns - 500 ns for Chip Erase.
2. Each PROG pulse is 200 ns - 500 ns for Write Code Data.
3. Each PROG pulse is 200 ns - 500 ns for Write Lock Bits.
4. RDY/BSY signal is output on P3.0 during programming.
5. X = don’t care.
Table 7. Flash Programming Modes
Mode
V
CC
RST
PSEN
ALE/
PROG
EA/
V
PP
P2.6
P2.7
P3.3
P3.6
P3.7
P0.7-0
Data
P2.3-0
P1.7-0
Address
Write Code Data
5V
H
L
(2)
12V
L
H
H
H
H
D
IN
A11-8
A7-0
Read Code Data
5V
H
L
H
H
L
L
L
H
H
D
OUT
A11-8
A7-0
Write Lock Bit 1
5V
H
L
(3)
12V
H
H
H
H
H
X
X
X
Write Lock Bit 2
5V
H
L
(3)
12V
H
H
H
L
L
X
X
X
Write Lock Bit 3
5V
H
L
(3)
12V
H
L
H
H
L
X
X
X
Read Lock Bits
1, 2, 3
5V
H
L
H
H
H
H
L
H
L
P0.2,
P0.3,
P0.4
X
X
Chip Erase
5V
H
L
(1)
12V
H
L
H
L
L
X
X
X
Read Atmel ID
5V
H
L
H
H
L
L
L
L
L
1EH
0000
00H
Read Device ID
5V
H
L
H
H
L
L
L
L
L
61H
0001
00H
Read Device ID
5V
H
L
H
H
L
L
L
L
L
06H
0010
00H