Renesas Hitachi H8S/2194 Series Hardware Manual page 271

(3) Port Data Register 1 (PDR1)
7
Bit :
PDR17
Initial value : 0
R/W : R/W
Port data register 1 (PDR1) stores the data for the pins P17 to P10 of port 1. When PCR1 is 1
(output), the PDR1 values are directly read if port 1 is read. Accordingly, the pin states are not
affected. When PCR1 is 0 (input), the pin states are read if port 1 is read.
PDR1 is an 8-bit read/ write enable register. When reset, PDR1 is initialized to H'00.
(4) MOS Pull-Up Select Register 1 (PUR1)
7
Bit :
PUR17
Initial value : 0
R/W : R/W
MOS pull-up selector register 1 (PUR1) controls the on and off of the MOS pull-up transistor of
port 1. Only the pin whose corresponding bit of PCR1 was set to 0 (input) becomes valid.
When the corresponding bit of PCR1 is set to 1 (output), the corresponding bit of PUR1 becomes
invalid and the MOS pull-up transistor is turned off.
PUR1 is an 8-bit read/ write enable register. When reset, PUR1 is initialized to H'00.
Bit n
PUR1n Description
0 The P1n pin has no MOS pull-up transistor
1 The P1n pin has a MOS pull-up pin
Rev. 2.0, 11/00, page 244 of 1037
6 5
PDR16 PDR15 PDR14
0 0
R/W R/W
6 5
PUR16 PUR15 PUR14
0 0
R/W R/W
4 3
PDR13 PDR12
0 0
R/W R/W R/W
4 3
PUR13 PUR12
0 0
R/W R/W R/W
2 1 0
PDR11 PDR10
0 0 0
R/W R/W
2 1 0
PUR11 PUR10
0 0 0
R/W R/W
(Initial value)
(n = 7 to 0)