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Input
Port
Function
During
Name
Name
Reset
–
D0-D7
OFF
P10-P17
D8-D15
P54(*1)
ON
BUSRQ
–
P55(*1)
OFF
P56(*1)
WAIT
SCK
P70
OPTRX0
ON
P71(*1)
SDA
SI
P72(*1)
SCL
–
P80-P82(*2)
OFF
P83(*2)
ADTRG
–
P84-P87(*2)
PB0
TA0IN
–
PB1
ON
–
PB2
PB3
INT0
PB4
INT1
PB5
INT2
OFF
PB6
INT3
–
PC0
PC1
RXD0
SCLK0
PC2
CTS0
ON
–
PC3
PC4
RXD1
SCLK1
PC5
CTS1
–
PZ2(*1)
OFF
–
PZ3(*1)
–
NMI
–
RESET
ON
–
AM0,AM1
–
X1,XT1
ON: The buffer is always turned on. A current flows the
input buffer if the input pin is not driven.
OFF: The buffer is always turned off.
– : No applicable
Note: Condition A/B are as follows.
SYSCR2 register setting
<DRVE>
<SELDRV>
0
0
0
1
1
0
1
1
Table 3.3.6 Input Buffer State Table
When the CPU is
In HALT mode(IDLE2)
operating
When Used
When
as function
Used as
Pin
Input Port
–
ON upon
external read
ON
ON
–
ON
ON
–
ON upon
ON
port read
–
ON
–
ON
–
ON
ON
–
ON
–
–
ON
*1: Port having a pull-up/pull-down resistor.
*2: AIN input does not cause a current to flow through the buffer.
HALT mode
IDLE1
STOP
Condition B
Condition A
Condition A
Condition B
Condition B
91C824-35
Input Buffer State
Condition A (Note)
When
When
When
Used as
Used as
Used as
function
function
Input Port
Pin
Pin
–
OFF
OFF
OFF
ON
ON
–
–
OFF
OFF
ON
ON
ON
–
–
OFF
ON
ON
–
–
ON
OFF
–
–
ON
ON
ON
OFF
–
–
ON
OFF
ON
–
–
ON
OFF
–
–
OFF
ON
–
ON
TMP91C824
In HALT mode(IDLE1/STOP)
Condition B (Note)
When
When Used
When
Used as
as function
Used as
Input Port
Pin
Input Port
–
–
OFF
OFF
OFF
ON
ON
–
OFF
OFF
ON
ON
ON
–
OFF
ON
–
OFF
ON
–
ON
ON
ON
OFF
–
ON
OFF
ON
–
ON
–
OFF
–
–
ON
IDLE1 : ON , STOP : OFF
2008-02-20
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