10
µPD750008 USER'S MANUAL
Table 2-1. Digital I/O Port Pins (2/2)
Input Also 8 bit Upon I/O
Pin output used Function circuit
as I/O reset typeNote 1
P40- I/O — N-ch open-drain 4-bit I/O port (PORT4). O High level (when M-D
P43Note 2, 4 Withstand voltage is 13 V in open-drain a pull-up resistor (M-E)Note 3
mode. is provided) or
A pull-up resistor can be provided bit high impedance
by bit (mask option)Note 5.
Data input/output pins for writing/
verifying (lower 4 bits of program
memory (PROM).
P50- I/O — N-ch open-drain 4-bit I/O port (PORT5). O High level (when M-D
P53Note 2, 4 Withstand voltage is 13 V in open-drain a pull-up resistor (M-E)Note 3
mode. is provided) or
A pull-up resistor can be provided bit high impedance
by bit (mask option)Note 5.
Data input/output pins for writing/
verifying (higher 4 bits of program
memory (PROM).
P60 I/O KR0 Programmable 4-bit I/O port (PORT6). O Input F -A
P61 KR1 I/O can be specified bit by bit.
P62 KR2 Built-in pull-up resistors can be
P63 KR3 connected by software in units of 4 bits.
P70 I/O KR4 4-bit I/O port (PORT7). Input F -A
P71 KR5 Built-in pull-up resistors can be
P72 KR6 connected by software in units of
P73 KR7 4 bits.
P80 I/O — 2-bit input port (PORT8). x Input E-B
P81 — Built-in pull-up resistors can be
connected by software in units of 2 bits.
Notes 1. I/O circuits enclosed in circles have a Schmitt-triggered input.
2. An LED can be driven directly.
3. ( ): µPD75P0016
4. When pull-up resistors that can be specified with the mask option are not
incorporated (when pins are used as N-ch open-drain input ports), the input leak low
current increases when an input instruction or bit operation instruction is executed.
5. These pins of the µPD75P0016 are not provided with pull-up resistors by mask option, and are
always open.
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