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GMS81C2112 Datasheet(PDF) 53 Page - Hynix Semiconductor

No. de Pieza. GMS81C2112
Descripción  HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
Descarga  107 Pages
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Fabricante  HYNIX [Hynix Semiconductor]
Página de inicio  http://www.skhynix.com/ko/index.jsp
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GMS81C2112 Datasheet(HTML) 53 Page - Hynix Semiconductor

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GMS81C2112/GMS81C2120
JUNE. 2001 Ver 1.00
47
8-bit Event Counter Mode
In this mode, counting up is started by an external trigger.
This trigger means falling edge or rising edge of the EC0
pin input. Source clock is used as an internal clock selected
with timer mode register TM0. The contents of timer data
register TDR0 is compared with the contents of the up-
counter T0. If a match is found, an timer interrupt request
flag T0IF is generated, and the counter is cleared to “0”.
The counter is restart and count up continuously by every
falling edge or rising edge of the EC0 pin input.
The maximum frequency applied to the EC0 pin is fXIN/2
[Hz].
In order to use event counter function, the bit 2 of the R5
function register (R5FUNC.2) is required to be set to “1”.
After reset, the value of timer data register TDR0 is unde-
fined, it should be initialized to between 1H~FFHnot to
"0"The interval period of Timer is calculated as below
equation.
Figure 12-5 Event Counter Mode Timing Chart
Figure 12-6 Count Operation of Timer / Event counter
Period (sec)
1
f
XIN
-----------
2
Divide Ratio
TDR0
×
×
×
=
0
1
2
1
0
n
2
n-1
n
ECn pin input
Up-counter
TDR1
T1IF interrupt
Start count
Timer 1 (T1IF)
Interrupt
TDR1
TIME
Occur interrupt
Occur interrupt
stop
clear & start
disable
enable
Start & Stop
T1ST
T1CN
Control count
T1ST = 0
T1ST = 1
T1CN = 0
T1CN = 1


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