AT89S8253 Atmel Corporation, AT89S8253 Datasheet - Page 41

• Manufacturer Part Number: AT89S8253
• Manufacturer: Atmel Corporation

Specifications of AT89S8253

• Flash (kbytes): 12 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.25
• Eeprom (bytes): 2048
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 3
• Isp: SPI
• Watchdog: Yes

25. Flash and EEPROM Parallel Programming Modes
Notes:
3286P–MICRO–3/10
Mode
Serial Prog. Modes
Chip Erase
Page Write
Read
Page Write
Read
Write Lock Bits
Read Lock Bits
Page Write
Read
Read
Write
Fuse
Read Fuse
(2)(4)(7)
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.
7. Fuse Definitions:
(2)
(3)(4)(5)
(3)(4)(6)
(3)(4)(5)
Fuse1 (Serial Programming Fuse): This fuse enables/disables the serial programming mode (ISP).
Fuse2 (x2 Mode Selection Fuse): This fuse enables/disables the internal x2 clock mode.
Fuse1
Fuse2
Fuse3
Fuse4
(2)(4)
(1)
}
}
}
}
12K Code
12K Code
2K Data
2K Data
Bit - 1
Bit - 2
Bit - 3
Bit - 1
Bit - 2
Bit - 3
User Row
User Row
Sig. Row
SerialPrgEn
SerialPrgDis
x2 ClockEn
x2 ClockDis
UsrRowPrgEn
UsrRowPrgDis
External Clock En
Crystal Clock En
SerialPrg (Fuse1)
x2 Clock (Fuse2)
UsrRow Prg
(Fuse3)
Clock Select
(Fuse4)
RST
H
H
H
H
H
H
H
H
H
H
H
H
H
PSEN
h
L
L
L
L
L
L
L
L
L
L
L
L
1.0 µs
1.0 µs
1.0 µs
1.0 µs
1.0 µs
1.0 µs
ALE
H
H
H
H
H
H
h
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
EA
P3.3
H
H
H
H
H
L
L
L
L
L
L
L
P3.4
H
H
H
H
H
L
L
L
L
L
L
L
P3.5
H
H
H
H
H
H
H
H
H
H
L
L
P3.6
H
H
H
H
H
H
L
L
L
L
L
L
P3.7
H
H
H
H
H
H
H
H
L
L
L
L
AT89S8253
Data I/O
D0 = 0
D1 = 0
D2 = 0
D0 = 0
D0 = 1
D1 = 0
D1 = 1
D2 = 0
D2 = 1
D3 = 0
D3 = 1
P0.7:0
DO
DO
DO
DO
D0
D1
D2
D0
D1
D2
D2
DI
DI
DI
X
Address
0 - 3FH
0 - 3FH
0 - 3FH
P2.5:0,
ADDR
ADDR
ADDR
ADDR
P1.7:0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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