Expanded
Modes
Single-Chip
Mode
Port
Description
Pins
Mode 1
Mode 2
Mode 3
Port 7
• 8-bit input port
P77/AN7/DA1
P76/AN6/DA0
P75 to P70
A/D converter analog input (AN7, AN6), D/A converter
analog output (DA1, DA0), or general input
A/D converter analog input (AN5 to AN0) or general
input
AN5 to AN0
P86/IRQ5/SCK1/SCL
Port 8
• 7-bit I/O port
Serial communication interface 1 input/output (TxD1,
RxD1, SCK1), HIF control input/output (CS2/IOW), I2C
clock input/output (SCL), external interrupt input (IRQ5,
IRQ4, IRQ3) or general input/output
• Bus buffer drive P85/CS2/IRQ4/RxD1
capability (P86)
P84/IOW/IRQ3/TxD1
P83/IOR
P82/CS1
P81/GA20
P80/HA0
HIF control input/output (HA0, GA20, CS1, IOR), or
general input/output
Port 9
• 8-bit I/O port
P97/WAIT/SDA
Expanded data bus control input
(WAIT), I2C data input/output (SDA), or input/output
I2C data
• Bus buffer drive
capability (P97)
general input/output
(SDA) or
general input/
output
P96/ø
System clock (ø)
output
System clock (ø)
output
ø output or
general input
P95/AS
Expanded
data bus
(RD, WR, AS)
Expanded
data bus
(RD, WR, AS)
General
input/output
P94/WR
P93/RD
P92/IRQ0
HIF control input/output (ECS2, EIOW), A/D converter
trigger input (ADTRG), external interrupt (IRQ2 to IRQ0),
or general input/output
P91/IRQ1/EIOW
P90/ADTRG/IRQ2/ECS2
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