Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 109)

Rev.A - May 17, 2001 109

Preliminary

T89C51CC02

16.7. PCA Registers

CMOD (S:D8h)

PCA Counter Mode Register

Reset Value = 00XX X000b

Figure 110. CMOD Register

7 6 5 4 3 2 1 0

CIDL WDTE - - - CPS1 CPS0 ECF

Bit Number Bit Mnemonic Description

7 CIDL

PCA Counter Idle Control bit

Clear to let the PCA run during Idle mode.

Set to stop the PCA when Idle mode is invoked.

6 WDTE

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.

2 CPS1

EWC Count Pulse Select bits

CPS1 CPS0 Clock source

0 0 Internal Clock, FPca/6

0 1 Internal Clock, FPca/2

1 0 Timer 0 overflow

1 1 External clock at ECI/P1.2 pin (Max. Rate = FPca/4)

1 CPS0

0 ECF

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.

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 136 137

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Rainbow-electronics T89C51CC02 Manual de usuario Pagina 109