AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 100

• 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

PCA Registers
100
AT89C51AC3
Table 50. CMOD Register
CMOD (S:D9h)
PCA Counter Mode Register
Reset Value = 00XX X000b
Number
CIDL
Bit
2-1
7
7
6
5
4
3
0
Mnemonic Description
CPS1:0
WDTE
WDTE
CIDL
ECF
Bit
6
-
-
-
PCA Counter Idle Control bit
Clear to let the PCA run during Idle mode.
Set to stop the PCA when Idle mode is invoked.
WatchDog Timer Enable
Clear to disable WatchDog Timer function on PCA Module 4,
Set to enable it.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
EWC Count Pulse Select bits
CPS1 CPS0 Clock source
0
0
1
1
Enable PCA Counter Overflow Interrupt bit
Clear to disable CF bit in CCON register to generate an interrupt.
Set to enable CF bit in CCON register to generate an interrupt.
5
-
0
1
0
1
Internal Clock, FPca/6
Internal Clock, FPca/2
Timer 0 overflow
External clock at ECI/P1.2 pin (Max. Rate = FPca/4)
4
-
3
-
CPS1
2
4383D–8051–02/08
CPS0
1
ECF
0