89C51IC2-CM ATMEL [ATMEL Corporation], 89C51IC2-CM Datasheet - Page 41

• Manufacturer Part Number: 89C51IC2-CM
• Description: 8-bit Flash Microcontroller with 2-wire Interface
• Manufacturer: ATMEL [ATMEL Corporation]

4301A–8051–01/04
Table 29. 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 30 &
Table 31).
Table 30. 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
Bit
7-0
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
X
X
X
X
X
X
0
0
trigger on CEXn
on CEXn
CEXn
mode.
16-bit capture by a negative trigger
No Operation
16-bit capture by a positive-edge
16-bit capture by a transition on
16-bit Software Timer / Compare
16-bit High Speed Output
8-bit PWM
Watchdog Timer (module 4 only)
2
-
AT89C51IC2
1
-
0
-
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