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

36

The counter/timer, prescaler, and associated mode registers are mapped into the

register file as shown in Figure 19. The software uses the counter/timer as a gen-

eral-purpose register, which eliminates the need for special instructions.

DEC

Hex identifiers

243

T1 prescaler

F3 PRE1

242

Timer/counter 1

F2 T1

241

Timer mode

F1 TMR

Figure 19. Register File

Prescaler and Counter/Timer

The prescaler PRE1 (F3h) consists of an 8-bit register and a 6-bit down-counter as

shown in Figure 18 on page 35. The prescaler register is a read-write register.

Figure 20 shows the prescaler register.

R243 PRE1

Prescaler 1 Register

(F3h; Read/Write)

D7 D6 D5 D4 D3 D2 D1 D0

Figure 20. Prescaler 1 Register

Count mode

1 = T1 modulo-N

0 = T1 single pass

Clock source

1 = T1 internal

0 = T1 external (TIN)

Prescaler modulo

(range: 1–64 decimal,

01h–00h)

PS003807-1002

PRELIMINARY

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