Rainbow-electronics T89C51AC2 Manuale Utente Scaricare il pdf (Pagina 75)

T89C51AC2

Rev. B – 19-Dec-01

15.9 PCA Registers Table 36. CMOD Register

CMOD (S:D8h)

PCA Counter Mode Register

Reset Value = 00XX X000b

76543210

CIDL WDTE - - - CPS1 CPS0 ECF

Bit

Number

Bit

Mnemonic Description

7CIDL

PCA Counter Idle Control bit

CleartoletthePCArunduringIdlemode.

SettostopthePCAwhenIdlemodeisinvoked.

6WDTE

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.

2CPS1

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)

1CPS0

0ECF

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 ... 70 71 72 73 74 75 76 77 78 79 80 ... 109 110

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Rainbow-electronics T89C51AC2 Manuale Utente Pagina 75