AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 19

• Manufacturer Part Number: AT89C51AC3
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC3

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

4383D–8051–02/08
Table 3. CKCON1 Register
CKCON1 (S:9Fh)
Clock Control Register 1
Note:
Reset Value = XXXX XXX0b
Number
Bit
7-1
7
0
1. This control bit is validated when the CPU clock bit X2 is set; when X2 is low, this bit
has no effect.
Mnemonic Description
SPIX2
Bit
6
-
Reserved
The value read from these bits is indeterminate. Do not set these bits.
SPI clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
5
(1)
4
3
2
1
SPIX2
0
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