HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 46

• Manufacturer Part Number: HMS87C5216
• Description: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

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),
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
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``)
Figure 12-13 Operatiion of Timer0
clock, Timer0 executes as event-counter.
Registers
T0 Value
T0 Data
Value
0
IFT0
Concurrence
CLEAR
INTERRUPT
Interval period
Concurrence
CLEAR
INTERRUPT
the up-counter is cleared to ``00 h``, and interrupt (IFT0, IFT1) is
occured at the next clock.
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)
3) Upper 8-bit Read 0B 0B
1) Upper 8-bit Read 0A 0A
2) Lower 8-bit Read FF 01
=====================
Concurrence
CLEAR
INTERRUPT
0AFF 0B01
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SEP. 2004 Ver 1.01