h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 255

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

8.2.4
Port 1 has an on-chip 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 P1DDR bit is cleared to 0 in mode 2 or 3, setting the corresponding P1PCR 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 8.4 summarizes the MOS input pull-up states.
Table 8.4
Legend:
Off:
On/Off: On when P1DDR = 0 and P1PCR = 1; otherwise off.
8.3
8.3.1
Port 2 is an 8-bit I/O port. Port 2 pins also function as address bus output pins (A15 to A8), 8-bit
PWM output pins (PW15 to PW8) (H8S/2138 Group only), and the timer connection output pin
(CBLANK) (H8S/2138 Group only). Port 2 functions change according to the operating mode.
Port 2 has an on-chip MOS input pull-up function that can be controlled by software.
Figure 8.5 shows the port 2 pin configuration.
Mode
1
2, 3
MOS input pull-up is always off.
MOS Input Pull-Up Function
Port 2
Overview
MOS Input Pull-Up States (Port 1)
Reset
Off
Off
Hardware
Standby Mode
Off
Off
Software
Standby Mode
Off
On/Off
Rev. 4.00 Jun 06, 2006 page 201 of 1004
In Other
Operations
Off
On/Off
Section 8 I/O Ports
REJ09B0301-0400