CHAPTER 12 PORT FUNCTIONS
User’s Manual U12688EJ4V0UM00
387
12.3.9 Port 8
Port 8 is an 8-bit input/output port that can be set to input or output in 1-bit units.
Address
FFFFF010H
7
P87
P8
6
P86
5
P85
4
P84
3
P83
2
P82
1
P81
0
P80
After reset
Undefined
Bit Position
Bit Name
Function
7 to 0
P8n (n = 7 to 0)
Port 8
Input/output port
In addition to their function as port pins, in the control mode, the port 8 pins operate as chip select signal outputs,
row address strobe signal outputs for DRAM, and read/write strobe signal outputs for external I/O.
(1) Operation in control mode
Port
Control Mode
Remark
Block Type
P80 to P83
CS0/RAS0 to CS3/RAS3
Chip select signal output
Row address signal output
O
P84
CS4/RAS4/IOWR
Chip select signal output
Row address signal output
Write strobe signal output
P85
CS5/RAS5/IORD
Chip select signal output
Row address signal output
Read strobe signal output
P
Port 8
P86, P87
CS6/RAS6, CS7/RAS7
Chip select signal output
Row address signal output
O
Содержание V850E/MS1 UPD703100
Страница 2: ...User s Manual U12688EJ4V0UM00 2 MEMO ...
Страница 6: ...User s Manual U12688EJ4V0UM00 6 MEMO ...
Страница 8: ...User s Manual U12688EJ4V0UM00 8 MEMO ...
Страница 12: ...User s Manual U12688EJ4V0UM00 12 MEMO ...
Страница 26: ...User s Manual U12688EJ4V0UM00 26 MEMO ...
Страница 68: ...User s Manual U12688EJ4V0UM00 68 MEMO ...
Страница 124: ...User s Manual U12688EJ4V0UM00 124 MEMO ...
Страница 198: ...User s Manual U12688EJ4V0UM00 198 MEMO ...
Страница 230: ...User s Manual U12688EJ4V0UM00 230 MEMO ...
Страница 422: ...User s Manual U12688EJ4V0UM00 422 MEMO ...