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| 型号： | M38C13E6HP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | 10 X 10 MM, PLASTIC, LQFP-64 |
| 文件页数： | 5/59页 |
| 文件大小： | 955K |
| 代理商： | M38C13E6HP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C1 Group
13
I/O PORTS
Direction Registers (Ports P2–P6)
The I/O ports (P2–P6) have direction registers which determine
the input/output direction of each individual pin.
When “0” is written to the bit corresponding to a pin, that pin be-
comes an input pin. When “1” is written to that bit, that pin be-
comes an output pin.
If data is read from a pin set to output, the value of the port output
latch is read, not the value of the pin itself. Pins set to input are
floating. If a pin set to input is written to, only the port output latch
is written to and the pin remains floating.
Pull-up/Pull-down Control
By setting the PULL register (address 003316), I/O ports can con-
trol pull-up/pull-down (pins also used as segment output pin: pull-
down, other pins: pull-up). Pull-up/pull-down of pins are performed
by setting the PULL register to “1”.
However, the contents of PULL register does not affect ports pro-
grammed as the output ports.
Input port P0 and I/O port P2 are pulled-down in the initial state.
Also, the pull-down setting is invalid for pins set to segment output
with the segment output enable register (address 003816).
Fig. 11 Structure of PULL register
b7
b0
PULL register
(PULL: address 003316, initial value: 0716)
P20–P23 pull-down
P24–P27 pull-down
Note
P30–P34 pull-up
P44–P47 pull-up
P50–P53 pull-up
P54–P57 pull-up
P60–P64 pull-up
Note: These ports are invalid when selecting SEG.
P00–P07 pull-down
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