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Rev. 2.0, 11/00, page 437 of 1037
22.2.3
Port Mode Register 1 (PMR1)
7
PMR17
0
R/W
6
PMR16
0
R/W
5
PMR15
0
R/W
4
PMR14
0
R/W
3
PMR13
0
R/W
0
PMR10
0
R/W
2
PMR12
0
R/W
1
PMR11
0
R/W
Bit :
Initial value :
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
(Initial value)
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/
,& pin is used as a P16 I/O pin or an ,& pin for the input capture
input of the prescalar unit.
Bit 6
PMR16
Description
0
The P16/
,&
pin functions as a P16 I/O pin
(Initial value)
1
The P16/
,&
pin functions as an
,&
input function
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
,& pin
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).
Содержание Hitachi H8S/2191
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