HD64F2149 Datasheet, PDF (239/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Modes 2 and 3 (EXPE = 0): In modes 2 and 3 (when EXPE = 0), port 2 pins function as PWM
outputs (timer connection output (CBLANK)) or I/O ports, and input or output can be specified on
a bit-by-bit basis. When a bit in P2DDR is set to 1, the corresponding pin functions as a PWM
output or output port, and when cleared to 0, as an input port. P27 can be used as an on-chip
supporting module output pin regardless of the P27DDR setting.
The port 2 pin functions are shown in figure 8.8.
Port 2
P2n: Input pin when P2DDR = 0,
output pin when P2DDR = 1
and PWOERB = 0
P27 (I/O)/CBLANK (Output)
P26 (I/O)
P25 (I/O)
P24 (I/O)
P23 (I/O)
P22 (I/O)
P21 (I/O)
P20 (I/O)
When P2DDR = 1
and PWOERB = 1
PW15 (Output)/CBLANK (Output)
PW14 (Output)
PW13 (Output)
PW12 (Output)
PW11 (Output)
PW10 (Output)
PW9 (Output)
PW8 (Output)
Figure 8.8 Port 2 Pin Functions (Modes 2 and 3 (EXPE = 0))
8.3.4 MOS Input Pull-Up Function
Port 2 has a built-in MOS input pull-up function that can be controlled by software. This MOS
input pull-up function can be used in modes 2 and 3, and can be specified as on or off on a bit-by-
bit basis.
When a P2DDR bit is cleared to 0 in mode 2 or 3, setting the corresponding P2PCR bit to 1 turns
on the MOS input pull-up for that pin.
The MOS input pull-up function is in the off state after a reset and in hardware standby mode. The
prior state is retained in software standby mode.
Table 8.5 summarizes the MOS input pull-up states.
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