TMP91C824
91C824-79
2008-02-20
Port Z Register
7 6 5 4 3 2 1 0
Bit
symbol
PZ3
PZ2
RDE
Read/Write
R/W
R/W
After
reset
Data from external port
(Output latch register
is set to “1”.)
1
Function
0(Output
latch
register)
: Pull-up resistor OFF
1(Output latch register)
: Pull-up resistor ON
Port Z Control Register
7 6 5 4 3 2 1 0
Bit
symbol
PZ3C
PZ2C
Read/Write
W
After
reset
0
0
Function
0: Input 1: Output
Port Z Function Register
7 6 5 4 3 2 1 0
Bit symbol
−
PZ3F
PZ2F
Read/Write W
W
After reset
0
0
0
Function
Always
write 0
0: Port
1: R/
W
0: Port
1:
HWR
Note 1: Read-modify-write is prohibited for registers PZCR and PZFC.
Note 2: When port Z is used in input mode, the PZ register controls the built-in pull-up resistor. Read-
modify-write is prohibited in input mode or I/O mode. Setting the built-in pull-up resistor may be
depended on the states of the input pin.
Figure 3.5.28 Port Register for Port Z
PZFC
(007FH)
PZ
(007DH)
HWR
setting
PZFC<PZ2F> 1
PZCR<PZ2C> 1
PZCR
(007EH)