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