AT89S51 Atmel Corporation, AT89S51 Datasheet - Page 19

• Manufacturer Part Number: AT89S51
• Manufacturer: Atmel Corporation

Specifications of AT89S51

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Uart: 1
• Sram (kbytes): 0.125
• Operating Voltage (vcc): 4.0 to 5.5
• Timers: 2
• Isp: SPI
• Watchdog: Yes

Figure 18-2. Flash Memory Serial Downloading
19. Flash Programming and Verification Waveforms – Serial Mode
Figure 19-1. Serial Programming Waveforms
2487D–MICRO–6/08
3-33 MHz
DATA OUTPUT
INSTRUCTION
7
CLOCK IN
INPUT
6
5
P1.5/MOSI
P1.6/MISO
P1.7/SCK
XTAL2
XTAL1
GND
AT89S51
4
RST
V
CC
3
V
CC
2
V
IH
1
0
AT89S51
19