AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 85
AT89C51RE2
Manufacturer Part Number
AT89C51RE2
Description
Manufacturer
Atmel Corporation
Specifications of AT89C51RE2
Flash (kbytes)
128 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
34
Spi
1
Uart
2
Sram (kbytes)
8.25
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART/OCD
Watchdog
Yes
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7663E–8051–10/08
Table 55. CCON Register
CCON - PCA Counter Control Register (D8h)
Reset Value = 00X0 0000b
Not bit addressable
The watchdog timer function is implemented in module 4 (See Figure 33).
The PCA interrupt system is shown in Figure 31.
Number
Bit
CF
7
7
6
5
4
3
2
1
0
Mnemonic
CCF4
CCF3
CCF2
CCF1
CCF0
CR
Bit
CR
CF
6
-
Description
PCA Counter Overflow flag
Set by hardware when the counter rolls over. CF flags an interrupt if bit ECF in CMOD is
set. CF
may be set by either hardware or software but can only be cleared by software.
PCA Counter Run control bit
Must be cleared by software to turn the PCA counter off.
Set by software to turn the PCA counter on.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
PCA Module 4 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
PCA Module 3 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
PCA Module 2 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
PCA Module 1 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
PCA Module 0 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
5
-
CCF4
4
CCF3
3
CCF2
2
AT89C51RE2
CCF1
1
CCF0
0
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