HD64F2149 Datasheet, PDF (294/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

PCNOCR and PDNOCR are 8-bit read/write registers, the individual bits of which specify the
output driver type for pins on ports C and D which are configured as outputs.
Setting a PCNOCR or PDNOCR bit to 1 disables the P-channel driver for the corresponding pin
on port C or port D. Clearing the bit to 0 enables the P-channel driver for the pin. Although the P-
channel drivers are always connected, the output driver type will be CMOS when the bit is cleared
to 0 and N-channel open-drain when it is set to 1.
PCNOCR and PDNOCR are initialized to H'00 by a reset and in hardware standby mode. They
retain their prior states in software standby mode.
DDR
NOCR
ODR
N-ch. driver
P-ch. driver
MOS Input Pul-Up
0
—
0
1
OFF
OFF
OFF
ON
0
0
ON
OFF
1
1
OFF
ON
OFF
1
0
1
ON
OFF
OFF
8.14.3 Pin Functions
The port C and port D pins have only one special function.
8.14.4 MOS Input Pull-Up Function
Port C and port D have a built-in MOS input pull-up function that can be controlled by software.
This MOS input pull-up function can be switched on or off on a bit-by-bit basis.
When a PCDDR or PDDDR bit is cleared to 0, setting the corresponding PCODR or PDODR bit
to 1 will turn on the MOS input pull-up for that pin.
The MOS input pull-up function is off after a reset and in hardware standby mode. The prior state
is retained when in software standby mode.
Table 8.28 is a summary of the MOS input pull-up states.
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