AT89C51RC2 Atmel Corporation, AT89C51RC2 Datasheet - Page 37
AT89C51RC2
Manufacturer Part Number
AT89C51RC2
Description
Manufacturer
Atmel Corporation
Specifications of AT89C51RC2
Flash (kbytes)
32 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
32
Spi
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
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4180E–8051–10/06
Table 25. PCA Module Modes (CCAPMn Registers)
There are two additional registers associated with each of the PCA Modules. They are
CCAPnH and CCAPnL and these are the registers that store the 16-bit count when a
capture occurs or a compare should occur. When a Module is used in the PWM mode
these registers are used to control the duty cycle of the output (see Table 26 and
Table 27).
Table 26. CCAPnH Registers (n = 0-4)
CCAP0H – PCA Module 0 Compare/Capture Control Register High (0FAh)
CCAP1H – PCA Module 1 Compare/Capture Control Register High (0FBh)
CCAP2H – PCA Module 2 Compare/Capture Control Register High (0FCh)
CCAP3H – PCA Module 3 Compare/Capture Control Register High (0FDh)
CCAP4H – PCA Module 4 Compare/Capture Control Register High (0FEh)
Reset Value = 0000 0000b
Not bit addressable
ECOMn
Number
X
X
X
0
1
1
1
1
7 - 0
Bit
7
-
CAPPn
0
1
0
1
0
0
0
0
Mnemonic Description
Bit
6
-
-
CAPNn
0
0
1
1
0
0
0
0
PCA Module n Compare/Capture Control
CCAPnH Value
MATn
5
-
0
0
0
0
1
1
0
1
TOGn
X
0
0
0
0
0
1
0
4
-
PWMm
0
0
0
0
0
0
1
0
3
-
ECCFn Module Function
AT89C51RB2/RC2
X
X
X
X
X
X
0
0
16-bit capture by a positive-edge
trigger on CEXn
16-bit capture by a negative trigger
on CEXn
16-bit capture by a transition on
CEXn
16-bit Software Timer/Compare
mode.
No Operation
16-bit High-speed Output
8-bit PWM
Watchdog Timer (Module 4 only)
2
-
1
-
0
-
37