HD6473228P10V Datasheet, PDF (114/301 Pages) Renesas Technology Corp – Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp

Table 5-14. Port 7 Pin Functions
Pin
Expanded modes
P70
P70 input/output or IS input
P71
P71 input/output
P72
P72 input/output
P73
P73 input or IOS output
P74
AS output
P75
WR output
P76
RD output
P77
WAIT input
Single-chip mode
P70 input/output or IS input
P71 input/output or OS output
P72 input/output or BUSY output
P73 input/output
P74 input/output
P75 input/output
P76 input/output
P77 input/output
Pins of port 7 can drive a single TTL load and a 90-pF capacitive load when they are used as output
pins.
Table 5-15 details the port 7 registers.
Table 5-15. Port 7 Registers
Name
Port 7 data direction register
Port 7 data register
Abbreviation
P7DDR
P7DR
Read/Write
W
R/W
Initial value
H’00
H’00
Address
H’FFBC
H’FFBE
Port 7 Data Direction Register (P7DDR)—H’FFBC
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
P77DDR P76DDR P75DDR P74DDR P73DDR P72DDR P71DDR P70DDR
0
0
0
0
0
0
0
0
W
W
W
W
W
W
W
W
P7DDR is an 8-bit register that selects the direction of each pin in port 7. A pin functions as an
output pin if the corresponding bit in P7DDR is set to 1, and as in input pin if the bit is cleared to 0.
Port 7 Data Register (P7DR)—H’FFBE
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
P77
P76
P75
P74
P73
P72
P71
P70
0
0
0
0
0
0
0
0
R/W R/W R/W R/W R/W R/W R/W R/W
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