Rainbow-electronics AT89C5131 Manual de usuario descargar pdf (Pagina 22)

22

AT89C5131

4136A–USB–03/03

Registers Table 26. CKCON0 (S:8Fh)

Clock Control Register 0

Reset Value = 0000 0000b

76543210

- WDX2 PCAX2 SIX2 T2X2 T1X2 T0X2 X2

Bit Number

Bit

Mnemonic Description

7-

Reserved

The value read from this bit is always 0. Do not set this bit.

6WDX2

Watchdog Clock

This control bit is validated when the CPU clock X2 is set. When X2 is low,

this bit has no effect.

Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle.

5PCAX2

Programmable Counter Array Clock

This control bit is validated when the CPU clock X2 is set. When X2 is low,

this bit has no effect.

Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle.

4SIX2

Enhanced UART Clock (Mode 0 and 2)

This control bit is validated when the CPU clock X2 is set. When X2 is low,

this bit has no effect.

Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle.

3T2X2

Timer2 Clock

This control bit is validated when the CPU clock X2 is set. When X2 is low,

this bit has no effect.

Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle.

2T1X2

Timer1 Clock

This control bit is validated when the CPU clock X2 is set. When X2 is low,

this bit has no effect.

Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle.

1T0X2

Timer0 Clock

This control bit is validated when the CPU clock X2 is set. When X2 is low,

this bit has no effect.

Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle.

0X2

System Clock Control bit

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

CPU

= F

PER =

F

OSC

/2).

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

CPU =

F

PER =

F

OSC

).

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