AT80C51RA2-RLSIV datasheet(29/85 Pages) IRF

29 / 85 page

4188E–8051–08/06

AT/TS8xC51Rx2

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 6-8 & Table 6-9)

Table 6-8.

CCAPnH: PCA Modules Capture/Compare Registers High

Table 6-9.

CCAPnL: PCA Modules Capture/Compare Registers Low

Table 6-10.

CH: PCA Counter High

Table 6-11.

CL: PCA Counter Low

6.3.1

PCA Capture Mode

To use one of the PCA modules in the capture mode either one or both of the CCAPM bits

CAPN and CAPP for that module must be set. The external CEX input for the module (on port 1)

is sampled for a transition. When a valid transition occurs the PCA hardware loads the value of

the PCA counter registers (CH and CL) into the module's capture registers (CCAPnL and

CCAPnH). If the CCFn bit for the module in the CCON SFR and the ECCFn bit in the CCAPMn

SFR are set then an interrupt will be generated (Refer to Figure 6-6).

CCAPnH Address

n = 0 - 4

CCAP0H=0FAH

CCAP1H=0FBH

CCAP2H=0FCH

CCAP3H=0FDH

CCAP4H=0FEH

654

Reset value

000

CCAPnL Address

n = 0 - 4

CCAP0L=0EAH

CCAP1L=0EBH

CCAP2L=0ECH

CCAP3L=0EDH

CCAP4L=0EEH

765

43210

Reset value000

00000

Address 0F9H

765

43210

Reset value000

00000

Address 0E9H

765

43210

Reset value000

00000

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