Renesas 7700 FAMILY User Manual page 18

Table 1.3.3 Pin description (3)
Pin
P4 –P4
I/O port P4
0 7
_____
HOLD,
____
RDY,
P4 –P4
2 7
_____
HOLD,
____
RDY,
φ
,
1
P4 –P4
3 7
P5 –P5 I/O port P5
0 7
P6 –P6
I/O port P6
0 7
P7 –P7
I/O port P7
0 7
P8 –P8 I/O port P8
0 7
Input/Output
Name
I/O
Input
Input
I/O
Input
Input
Output
I/O
I/O
I/O
I/O
I/O
7751 Group User's Manual
[Single-chip mode]
Port P4 is an 8-bit I/O port with the same function as
can be programmed as the clock φ
P0. P4
2
[Memory expansion mode]
_____
P4 functions as the HOLD input pin, P4
0
input pin. The microcomputer is in Hold state while "L"
_____
level is input to the HOLD pin.
The microcomputer is in Ready state while "L" level is
____
input to the RDY pin.
P4 –P4 function as I/O ports with the same functions
2 7
as P0.
can be programmed for the clock φ
P4
2
[Microprocessor mode]
_____
P4 functions as the HOLD input pin, P4
0
always functions as the clock φ
input pin. P4
2
pin.
P4 –P4 function as I/O ports with the same functions
3 7
as P0.
Port P5 is an 8-bit I/O port with the same function as
P0. These pins can be programmed as I/O pins for
Timers A0–A3.
Port P6 is an 8-bit I/O port with the same function as
P0. These pins can be programmed as I/O pins for
Timer A4, input pins for external interrupt and input
pins for Timers B0–B2.
Port P7 is an 8-bit I/O port with the same function as
P0. These pins can be programmed as input pins for
A-D converter.
Port P8 is an 8-bit I/O port with the same function as
P0. These pins can be programmed as I/O pins for
serial I/O.
DESCRIPTION
1.3 Pin description
Functions
output pin.
1
as the RDY
1
output pin.
1
as the RDY
1
____
____
output
1
1–7