AT89S8253_07 Datasheet, PDF (38/56 Pages) ATMEL Corporation – 8-bit Microcontroller with 12K Bytes Flash and 2K Bytes EEPROM

Flash and EEPROM Parallel Programming Modes
Mode
RST PSEN
ALE
Data Address
I/O
P2.5:0,
EA
P3.3 P3.4 P3.5 P3.6 P3.7 P0.7:0
P1.7:0
Serial Prog. Modes⁽¹⁾
H
h
h
Chip Erase⁽²⁾
H
L
1.0 µs
12V
H
L
H
L
L
X
X
Page Write^(3)(4)(5)
12K Code
H
L
1.0 µs
12V
L
H
H
H
H
DI
ADDR
Read
12K Code
H
L
H
12V
L
L
H
H
H
DO
ADDR
Page Write^(3)(4)(6)
2K Data
H
L
1.0 µs
12V
L
H
L
H
H
DI
ADDR
Read
2K Data
H
L
H
12V
L
L
L
H
H
DO
ADDR
Bit - 1
D0 = 0
X
Write Lock Bits⁽²⁾⁽⁴⁾
Bit - 2
H
L
1.0 µs
12V
H
L
H
H
L
D1 = 0
X
Bit - 3
D2 = 0
X
Bit - 1
D0
X
Read Lock Bits
Bit - 2
H
L
H
12V
H
H
H
L
L
D1
X
Bit - 3
D2
X
Page Write^(3)(4)(5)
User Row
H
L
1.0 µs
12V
H
L
H
H
H
DI
0 - 3FH
Read
User Row
H
L
H
12V
L
L
H
L
H
DO
0 - 3FH
Read
Sig. Row
H
L
H
12V
L
L
H
L
L
DO
0 - 3FH
Fuse1
SerialPrgEn
SerialPrgDis
D0 = 0
X
D0 = 1
X
Write
Fuse⁽²⁾⁽⁴⁾
Fuse2
x2 ClockEn
x2 ClockDis
H
L
1.0 µs
D1 = 0
X
12V
L
H
H
L
H
D1 = 1
X
Fuse3
UsrRowPrgEn
UsrRowPrgDis
D2 = 0
X
D2 = 1
X
SerialPrg (Fuse1)
D0
X
Read Fuse
x2 Clock (Fuse2)
UsrRow Prg
(Fuse3)
H
L
H
12V
H
H
H
L
H
D1
X
D2
X
Notes:
1. See detailed timing for Serial Programming Mode.
2. Internally timed for 8.0 ms.
3. Internally timed for 8.0 ms. Programming begins 150 µs (minimum) after the last write pulse.
4. P3.0 is pulled low during programming to indicate RDY/BSY
5. 1 to 64 bytes can be programmed at a time per page.
6. 1 to 32 bytes can be programmed at a time per page.
38 AT89S8253 [Preliminary]
3286A–MICRO–7/04