Syntek Semiconductor Co., Ltd
LCD Controller
7 / 7
ISSUE DATE : 3 March, 2000
STK55C641
* An '1' in this register will set the corresponding pin of port 4 as an output pin.
* The default value for each bit is zero. A pull-up resistor can be added to the pin by
code option. But the pull-up resistor will be disabled if the output state is low.
100C Set port 1 bit interrupt function. Write only.
* An '1' in this register will set the interrupt function of the corresponding pin of port 1
to be enable. That is, an interrupt will be generated if a low level is detected in the
pin.
* The default value for each bit is zero.
100D Timer 1 data. Read & write.
* Before writing $100D, the program should select timer clock
($100E) first.
* After timer 1 been enabled, the timer will start to count down. When timer counts to
zero, the timer will count from the initial value and IRQ3 will happen.
* The time elapse = ($100D)/timer clock
100E Timer 1 clock select. Write only.
Bit 2-0 : = 000 System clock/2
= 001 System clock/4
= 010 System clock/8
= 011 System clock/16
= 100 System clock/32
= 101 System clock/64
= 110 System clock/128
= 111 System clock/256
7-3 : Reserved
The default value is unknown.
100F Control register. Write only.
Bit
0 : = 0 Disable timer 1 output to SOUND pin.
= 1 Enable timer 1 output to SOUND pin.
1 : = 0 Disable timer 1 interrupt.
= 1 Enable timer 1 interrupt.
2 : = 0 Disable NMI.
= 1 Enable NMI.
3 : = 0 Disable timer 1.
= 1 Enable timer 1.
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