Renesas Hitachi H8S/2194 Series Hardware Manual page 277

(3) Port Data Register 2 (PDR2)
7
Bit :
PDR27
Initial value : 0
R/W : R/W
Port data register 2 (PDR2) stores the data for the pins P27 to P20 of port 2. When PCR2 is 1
(output), the PDR2 values are directly read if port 2 is read. Accordingly, the pin states are not
affected. When PCR2 is 0 (input), the pin states are read if port 2 is read.
PDR2 is an 8-bit read/write enable register. When reset, PDR2 is initialized to H'00.
(4) MOS Pull-Up Select Register 2 (PUR2)
7
Bit :
PUR27
Initial value :
0
R/W :
R/W
MOS pull-up selector register 2 (PUR2) controls the ON and OFF of the MOS pull-up transistor
of port 2. Only the pin whose corresponding bit of PCR1 was set to 0 (input) becomes valid. If
the corresponding bit of PCR2 is set to 1 (output), the corresponding bit of PUR2 becomes
invalid and the MOS pull-up transistor is turned off.
PUR2 is an 8-bit read/write enable register. When reset, PUR2 is initialized to H'00.
Bit n
PMR2n Description
0 The P2n pin has no MOS pull-up transistor
1 The P2n pin has a MOS pull-up transistor
Rev. 2.0, 11/00, page 250 of 1037
6 5
PDR26 PDR25 PDR24
0 0
R/W R/W
6 5
PUR26 PUR25 PUR24
0 0
R/W R/W
4 3
PDR23 PDR22
0 0
R/W R/W R/W
4 3
PUR23 PUR22
0 0
R/W R/W R/W
2 1 0
PDR21 PDR20
0 0 0
R/W R/W
2 1 0
PUR21 PUR20
0 0 0
R/W R/W
(Initial value)
(n = 7 to 0)