AT89C51RC Atmel Corporation, AT89C51RC Datasheet - Page 23

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AT89C51RC

Manufacturer Part Number
AT89C51RC
Description
Manufacturer
Atmel Corporation
Datasheet

Specifications of AT89C51RC

Flash (kbytes)
32 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
32
Uart
1
Sram (kbytes)
0.5
Operating Voltage (vcc)
4.0 to 6.0
Timers
3
Watchdog
Yes

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22. Programming Interface
Table 22-1.
Notes:
1920D–MICRO–6/08
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
1. Write Code Data requires a 200 ns PROG pulse.
2. Write Lock Bits requires a 100 µs PROG pulse.
3. Chip Erase requires a 200 ns - 500 ns PROG pulse.
4. RDY/BSY signal is output on P3.0 during programming.
Flash Programming Modes
V
6.5V
6.5V
6.5V
6.5V
5V
5V
5V
5V
5V
5V
CC
RST
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 AT89 microcontroller
series. Please contact your local programming vendor for the appropriate software revision.
H
H
H
H
H
H
H
H
H
H
PSEN
L
L
L
L
L
L
L
L
L
L
PROG
ALE/
(1)
(2)
(2)
(2)
(3)
H
H
H
H
H
EA/
12 V
H/12
12 V
12 V
12 V
V
12V
H
H
H
H
PP
V
P2.6
H
H
H
H
H
L
L
L
L
L
P2.7
H
H
H
H
L
L
L
L
L
L
P3.3
H
H
H
H
H
L
L
L
L
L
P3.6
H
H
H
H
H
L
L
L
L
L
P3.7
H
H
H
L
L
L
L
L
L
L
P0.7-0
Data
P0.2,
P0.3,
D
P0.4
1EH
51H
07H
D
OUT
X
X
X
X
IN
P3.4
A14
A14
AT89C51RC
X
X
X
X
X
X
X
X
XX 0000
XX 0001
XX 0010
Address
P2.5-0
A13-8
A13-8
X
X
X
X
X
P1.7-0
A7-0
A7-0
00H
00H
00H
X
X
X
X
X
23

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