HMS87C5216 Datasheet, PDF(46/76 Page) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

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HMS87C5216 Datasheet, PDF (46/76 Pages) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

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HMS87C5216

(3) Timer0, Timer1

TIMER0 and TIMER1 have an up-counter. When value of the

up-counter reaches the content of Timer Data Register (TDR),

the up-counter is cleared to ``00 h``, and interrupt (IFT0, IFT1) is

occured at the next clock.

T0 Data

Registers

Value

T0 Value

Concurrence

CLEAR

INTERRUPT

IFT0

Interval period

Figure 12-13 Operatiion of Timer0

For Timer0, the internal clock (PS) and the external clock (EC)

can be selected as counter clock. But Timer1 and Timer2 use only

internal clock. As internal clock. Timer0 can be used as internal-

timer which period is determined by Timer Data Register (TDR).

Chosen as external clock, Timer0 executes as event-counter.

The counter execution of Timer0 and Timer1 is controlled by

T0CN, T0ST, CAP0, T1CN, T1ST, of Timer Mode Register

TM0 and TM1. T0CN, T1CN are used to stop and start Timer0

and Timer1 without clearing the counter. T0ST, T1ST is used to

clear the counter. For clearing and starting the counter, T0ST or

T1ST should be temporarily set to ``0`` and then set to ``1``.

T0CN, T1CN, T0ST and T1ST should be set ``1``, when Timer

counting-up. Controlling of CAP0 enables Timer0 as input cap-

ture. By programming of CAP0 to ``1``, the period of signal from

INT2 can be measured and then, event counter value for INT2

can be read. During counting-up, value of counter can be read.

Timer execution is stopped by the reset signal (RESET = ``L``)

Note: In the process of reading 16-bit Timer Data, first

read the upper 8-bit data. Then read the lower 8-bit data,

and read the upper 8-bit data again. If the earlier read up-

per 8-bit data are matched with the later read upper 8-bit

data, read 16-bit data are correct. If not, caution should be

taken in the selection of upper 8-bit data.

(Example)

1) Upper 8-bit Read 0A 0A

2) Lower 8-bit Read FF 01

3) Upper 8-bit Read 0B 0B

=====================

0AFF 0B01

SEP. 2004 Ver 1.01

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