Table of Contents
Advertisement
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
P10 to P17
8
D8 to D15
P20 to P27
8
A16 to A23
A8 to A15
8
A0 to A7
8
1
RD
1
WR
P52
1
HWR
P53
1
WAIT
P54
1
BUSRQ
P55
1
BUSAK
P56
1
R
/
W
P60
1
CS0
P61
1
CS1
P62
1
CS2
/CS2A
P63
1
CS3
P64
1
EA24
/CS2B
P65
1
EA25
/CS2C
P66
1
/CS2D
P67
1
/CS2E
Note: An external DMA controller cannot access the device's built-in memory or built-in I/O devices using the
/BUSRQ and /BUSAK terminal. And in case of using LCDC's SR mode, don't use /BUSRQ and /BUSAK
terminal.
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 52: I/O port (with pull-up resistor)
Output
High Write: strobe signal for writing data to pins D8 to D15
I/O
Port 53: I/O port (with pull-up resistor)
Input
Wait: pin used to request CPU bus wait
I/O
Port 54: I/O port (with pull-up resistor)
Input
Bus Request: High-Impedance used to request Bus Release
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)
Output
Read/Write: 1 represents Read or Dummy cycle; 0 represents write cycle.
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
Chip Select 24: outputs "0" when address is within specified address area
Output
Expand Chip Select: 2B: outputs "0" when address is within specified address area
Output
Port 65: Output port
Output
Chip Select 25: outputs "0" when address is within specified address area
Output
Expand Chip Select: 2C: 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
91C815-6
TMP91C815
Functions
Advertisement
Table of Contents
