HMS91C8032 datasheet(47/157 Pages) HYNIX

47 / 157 page

HMS91C8032/97C8032

NOV., 2001 Ver 1.02

Mode 2

Mode 2 configures the Timer register as an 8-bit Counter (TL1)

with automatic reload, as shown in Figure 4-7. Overflow from

TL1 not only sets TF1, but also reloads TL1 with the contents of

TH1, which is preset by software. The reload leaves TH1 un-

changed.Mode 2 operation is the same for Timer/Counter 0.

Mode 3

Timer 1 in Mode 3 simply holds its count. The effect is the same

as setting TR1 = 0.

Timer 0 in Mode 3 establishes TL0 and TH0 as two separate

counters. The logic for Mode 3 on Timer 0 is shown in Figure 4-8.

TL0 uses the Timer 0 control bits: C/T, GATE, TR0, INT0, and

TF0. TH0 is locked into a timer function (counting machine cy-

cles) and takes over the use of TR1 and TF1 from Timer 1. Thus,

TH0 now controls the "Timer 1" interrupt.

Mode 3 is provided for applications requiring an extra 8-bit timer

on the counter. With Timer 0 in Mode 3, an HMS9XC8032 can

look like it has three Timer/Counters. When Timer 0 is in Mode

3, Timer 1 can be turned on and off by switching it out of and into

its own Mode 3, or can still be used by the serial port as a baud

rate generator, or in fact, in any application not requiring an inter-

rupt.

Figure 4-5 TMOD Register

Figure 4-6 Timer/Counter Mode 0: 13-bit Counter

(MSB)

(LSB)

Gate

Gating Control when set. Timer/Counter

"x" is enabled only while "INTx" pin is high

and "TRx" control pin is set. When

cleared Timer "x" is enabled whenever

"TRx" control bit is set.

Gate

Timer or Counter Selector cleared for Timer

operation (imput from internal system clock).

Set for Counter operation (input from "Tx"

input pin).

8048 Timer "TLx" serves as 5-bit prescaler.

16-bit Timer/Counter "THx" and "TLx" are

cascaded : there is no prescaler.

8-bit auto-reload Timer/Counter "THx" holds

a value which is to be reloaded into "TLx"

each time it overflows.

Operating

(Timer 0) TL0 is an 8-bit Timer/Counter

controlled by the standard Timer 0 control

bits. TH0 is an 8-bit timer only controlled by

Timer 1 control bits.

(Timer 1) Timer/Counter 1 stopped.

Timer 1

Timer 0

13-bit Timer/Counter

TL1

(8-Bits)

osc.

T1 Pin

Control

TH1

(8-Bits)

TF1

TR1

Gate

Interrupt

= 0

= 1

INT1

fCPU

HMS91C8032 Datasheet(PDF) 47 Page - Hynix Semiconductor

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