Z86L99X 查看數據表（PDF） - Zilog

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Z86L99X

Low-Voltage Microcontrollers with ADC

Zilog 

Z86D990/Z86D991 OTP and Z86L99X ROM

Low-Voltage Microcontrollers with ADC

37

The six most significant bits (D2–D7) of PRE1 hold the prescaler count modulo, a

value from 11 to 64 decimal. The prescaler register also contains control bits that

specify T1 counting modes. These bits also indicate whether the clock source for

T1 is internal or external.

The counter/timer T1 (F2h) consists of an 8-bit down-counter, a write-only register

that holds the initial count value, and a read-only register that holds the current

count value (see Figure 18 on page 35). The initial value can range from 1 to 256

decimal (01h, 02h, ..., 00h). Figure 21 illustrates the counter/timer register.

R242 T1

Counter/Timer 1 Register

(F2h; Read/Write)

D7 D6 D5 D4 D3 D2 D1 D0

Figure 21. Counter/Timer 1 Register

Initial value when written

(range 1–256 decimal, 01h–00h)

Current value when read

Counter/Timer Operation

Under software control, T1 is started and stopped using the Timer Mode register

(F1h) bits D2–D3: a Load bit and an Enable Count bit. See Figure 22.

R241 TMR

Timer Mode Register

(F1h; Read/Write)

D3 D2 D1 D0

Figure 22. Timer Mode Register

Reserved

0 = No function

1 = Load T1

0 = Disable T1 count

1 = Enable T1 count

PS003807-1002

PRELIMINARY

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