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2.3
Pin Names and Functions
The names of the input/output pins and their functions are described below.
Table 2.2 Pin names and functions.
Number
Pin Name
of Pins
D0 to D7
8
8
P10 to P17
D8 to D15
8
P20 to P27
A16 to A23
8
A8 to A15
A0 to A7
8
/RD
1
1
/WR
1
PZ2
/HWR
1
PZ3
＿＿＿＿
R/W
1
P54
/BUSRQ
1
P55
/BUSAK
1
P56
/WAIT
1
P60
/CS0
1
P61
/CS1
1
P62
/CS2
/CS2A
1
P63
/CS3
1
P64
EA24
/CS2B
1
P65
EA25
/CS2C
P66
1
/CS2D
P67
1
/CS2E
.
I/O
I/O
Data (lower): bits 0 to 7 of data bus
I/O
Port 1: I/O port that allows I/O to be selected at the bit level
(When used to the external 8bit bus)
I/O
Data (upper): bits 8 to15 of data bus
Output
Port 2: Output port
Output
Address: bits 16 to 23 of address bus
Output
Address: bits 8 to 15 of address bus
Output
Address: bits 0 to 7 of address bus
Output
Read: strobe signal for reading external memory
Output
Write: strobe signal for writing data to pins D0 to D7
I/O
Port Z2: I/O port (with pull-up resistor)
Output
High Write: strobe signal for writing data to pins D8 to D15
I/O
Port Z3: I/O port (with pull-up resistor)
Output
I/O
Port 54: I/O port (with pull-up resistor)
Input
Bus Request: High-Impedance used to request Bus Release
Read/Write: 1 represents Read or Dummy cycle; 0 represents write cycle.
I/O
Port 55: I/O port (with pull-up resistor)
Output
Bus Acknowledge: signal used to acknowledge Bus Release
I/O
Port 56: I/O port (with pull-up resistor)
Input
Wait: pin used to request CPU bus wait
Output
Port 60:Output port
Output
Chip select 0: Outputs "0" when address is within specified address area.
Output
Port 61:Output port
Output
Chip Select 1: outputs "0" when address is within specified address area
Output
Port 62: Output port
Output
Chip Select 2: outputs "0" when address is within specified address area
Output
Expand Chip Select: 2A: outputs 0 when address is within specified address area
Output
Port 63:Output port
Output
Chip Select 3: outputs "0" when address is within specified address area
Output
Port 64: Output port
Output
(Address 24: Expand address)
Output
(Expand Chip Select: 2B: outputs "0" when address is within specified address area)
Output
Port 65: Output port
Output
(Address 25: Expand address)
Output
(Expand Chip Select: 2B: outputs "0" when address is within specified address area)
Output
Port 66: Output port
Output
(Expand Chip Select: 2D: outputs "0" when address is within specified address area)
Output
Port 67: Output port
Output
(Expand Chip Select: 2E: outputs "0" when address is within specified address area)
91C824-6
Functions
TMP91C824
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