AT89C51IC2 Atmel Corporation, AT89C51IC2 Datasheet - Page 15

• Manufacturer Part Number: AT89C51IC2
• Manufacturer: Atmel Corporation

Specifications of AT89C51IC2

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

4301D–8051–02/08
Table 15. OSCCON Register
OSCCON- Oscillator Control Register (86h)
Reset Value = XXXX X0’HSB.OSC’’HSB.OSC’b (see Hardware Security Byte (HSB)
Table 84)
Not bit addressable
Table 16. CKRL Register
CKRL - Clock Reload Register
Reset Value = 1111 1111b
Not bit addressable
Number
Number
Bit
Bit
7:0
7
7
-
-
7
6
5
4
3
2
1
0
Mnemonic Description
Mnemonic Description
SCLKT0
OscBEn
OscAEn
CKRL
Bit
6
6
-
-
-
-
-
-
-
Reserved
Reserved
Reserved
Reserved
Reserved
Sub Clock Timer0
Cleared by software to select T0 pin
Set by software to select T0 Sub Clock
Cleared by hardware after a Power Up
OscB enable bit
Set by software to run OscB
Cleared by software to stop OscB
Programmed by hardware after a Power-up regarding HSB.OSC (Default
cleared, OSCB stopped)
OscA enable bit
Set by software to run OscA
Cleared by software to stop OscA
Programmed by hardware after a Power-up regarding HSB.OSC(Default Set,
OSCA runs)
Clock Reload Register:
Prescaler value
5
5
-
-
4
4
-
-
3
3
-
-
SCLKT0
2
2
-
OscBEn
1
1
-
OscAEn
0
0
-
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