Zilog Z08470 Uživatelský manuál stáhnout pdf (Strana 23)

100

101

UM008101-0601 Counter/Timer Channels

The Prescaler

The prescaler is an 8-bit device that is used in the TIMER mode only. The

prescaler is programmed by the CPU through the Channel Control register

to divide its input, the System clock (0), by 16 or 256. The output of the

prescaler is then fed as an input to clock the down-counter. Each time that

Table 2. Channel Control Register

76543210

Interrupt Mode Prescaler

Val ue*

CLK/TRG

Section

Time

Trigger*

Time

Constant

Reset Control or

Vec tor

R/W R/W R/W R/W R/W R/W R/W R/W

Bit Number Field R/W Value Description

7 Interrupt R/W 1

Enable Interrupt

Disable Interrupt

6Mode R/W1

COUNTER Mode

TIMER Mode

5 Prescaler Value* R/W 1

256

4 CLK/TRG Edge

Section

R/W 1

Rising Edge

Falling Edge

3 Time Trigger* R/W 1

CLK/TRG Pulse Starts Timer

Automatic trigger when time constant is loaded

2 Time Constant R/W 1

Time Constant Follows

No Time Constant Follows

1 Reset R/W 1

Software Reset

Continue Operation

0 Control or Vector R/W 1

Control

Vec tor

*TIMER mode only

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 329 330

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