AT89S52-33AC ATMEL Corporation, AT89S52-33AC Datasheet - Page 18

• Manufacturer Part Number: AT89S52-33AC
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

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.
Table 8. Flash Programming Modes
Notes:
Figure 13. Programming the Flash Memory
18
Mode
Write Code Data
Read Code Data
Write Lock Bit 1
Write Lock Bit 2
Write Lock Bit 3
Read Lock Bits
1, 2, 3
Chip Erase
Read Atmel ID
Read Device ID
Read Device ID
3-33 MHz
PROGRAMMING
MODES TABLE
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.
SEE FLASH
0000H/1FFFH
(Parallel Mode)
ADDR.
V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
A8 - A12
CC
A0 - A7
RST
H
H
H
H
H
H
H
H
H
H
P1.0-P1.7
P2.0 - P2.4
P2.6
P2.7
P3.3
P3.6
P3.7
XTAL2
XTAL1
GND
AT89S52
AT89S52
PSEN
L
L
L
L
L
L
L
L
L
L
PSEN
P3.0
RST
ALE
V
EA
P0
CC
PROG
ALE/
H
H
H
H
H
V
(2)
(3)
(3)
(3)
(1)
CC
PGM
DATA
PROG
V /V
V
RDY/
BSY
IH
IH
PP
EA/
V
12V
12V
12V
12V
12V
H
H
H
H
H
PP
P2.6
H
H
H
H
H
L
L
L
L
L
All major programming vendors offer worldwide support for
the Atmel microcontroller series. Please contact your local
programming vendor for the appropriate software revision.
Figure 14. Verifying the Flash Memory (Parallel Mode)
P2.7
H
H
H
H
L
L
L
L
L
L
3-33 MHz
PROGRAMMING
MODES TABLE
0000H/1FFFH
SEE FLASH
P3.3
H
H
H
H
H
L
L
L
L
L
ADDR.
P3.6
H
H
H
H
H
L
L
L
L
L
A8 - A12
A0 - A7
P3.7
H
H
H
L
L
L
L
L
L
L
P1.0-P1.7
P2.0 - P2.4
P2.6
P2.7
P3.3
P3.6
P3.7
XTAL 2
XTAL1
GND
AT89S52
P0.7-0
Data
D
1EH
52H
06H
P0.2,
P0.3,
P0.4
D
OUT
X
X
X
X
IN
PSEN
RST
ALE
V
EA
P0
CC
P2.4-0
X 0000
X 0001
X 0010
A12-8
A12-8
X
X
X
X
X
V
PGM DATA
(USE 10K
PULLUPS)
CC
Address
V
V
IH
IH
P1.7-0
A7-0
A7-0
00H
00H
00H
X
X
X
X
X