Rainbow-electronics AT89C5132 Uživatelský manuál stáhnout pdf (Strana 15)

AT8xC5132

4173A–8051–08/02

Registers Table 16. CKCON Register

CKCON (S:8Fh) – Clock Control Register

Reset Value = 0000 000Xb

76543210

- WDX2 - - - T1X2 T0X2 X2

Bit

Number

Bit

Mnemonic Description

Reserved

The values read from this bit is indeterminate. Do not set this bit.

6WDX2

Watchdog Clock Control Bit

Set to select the oscillator clock divided by two as watchdog clock input (X2

independent).

Clear to select the peripheral clock as watchdog clock input (X2 dependent).

5 - 3 -

Reserved

The values read from these Bits are indeterminate. Do not set these Bits.

2T1X2

Timer 1 Clock Control Bit

Set to select the oscillator clock divided by two as Timer 1 clock input (X2

independent).

Clear to select the peripheral clock as Timer 1 clock input (X2 dependent).

1T0X2

Timer 0 Clock Control Bit

Set to select the oscillator clock divided by two as timer 0 clock input (X2

independent).

Clear to select the peripheral clock as timer 0 clock input (X2 dependent).

0X2

System Clock Control Bit

Clear to select 12 clock periods per machine cycle (STD mode, F

CPU

= F

PER

OSC

/2).

Set to select 6 clock periods per machine cycle (X2 mode, F

CPU

= F

PER

= F

OSC

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 161 162

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