Port Mode Register 1 (Pmr1); Noise Cancel Circuit - Renesas Hitachi H8S/2194 Series Hardware Manual

22.2.3

Port Mode Register 1 (PMR1)

Bit :
7
PMR17
Initial value : 0
R/W
R/W :
The port mode register 1 (PMR1) controls switching of each pin function of port 1. The
switching is specified in a unit of bit.
PMR1 is an 8-bit read/write enable register. When reset, PMR1 is initialized to H'00.
Bit 7: P17/TMOW Pin Switching (PMR17)
PMR17 sets whether the P17/TMOW pin is used as a P17 I/O pin or a TMOW pin for division
clock output.
Bit 7
PMR17 Description
0 The P17/TMOW pin functions as a P17 I/O pin
1 The P17/TMOW pin functions as a TMOW pin for division clock output
,& ,&
Bit 6: P16/ Pin Switching (PMR16)
PMR16 sets whether the P16/
input of the prescalar unit.
Bit 6
PMR16 Description
0 The P16/
1 The P16/
22.3

Noise Cancel Circuit

,&
The pin has a built-in a noise cancel circuit. The circuit can be used for noise protection such
as remote control receiving. The noise cancel circuit samples the input values of the
twice at an interval of 256 states. If the input values are different, they are assumed to be noise.
,&
The pin can specify enable/disable of the noise cancel function according to the bit 4
(NCon/off) of the prescalar unit control/status register (PCSR).
6 5
PMR16 PMR15
0 0
R/W R/W
,&
pin is used as a P16 I/O pin or an
,&
pin functions as a P16 I/O pin
,&
pin functions as an
4 3
PMR14 PMR13
0 0
R/W R/W
,&
input function
Rev. 2.0, 11/00, page 437 of 1037
2 1
PMR12 PMR11 PMR10
0 0
R/W R/W
(Initial value)
,&
pin for the input capture
(Initial value)
,&
0
0
R/W
pin