HD64F2149 Datasheet, PDF (289/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

8.12.4 MOS Input Pull-Up Function
Port B 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 1, 2, and 3 (EXPE = 1) with the ABW bit in WSCR
set to 1, and in modes 2 and 3 (EXPE = 0), and can be specified as on or off on a bit-by-bit basis.
When a PBDDR bit is cleared to 0, setting the corresponding PBODR bit to 1 turns on the MOS
input pull-up for that pin. When a pin is designated as an on-chip supporting module output pin,
the MOS input pull-up is always off.
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 8.25 summarizes the MOS input pull-up states.
Table 8.25 MOS Input Pull-Up States (Port B)
Mode
Reset
Hardware
Standby Mode
Software
Standby Mode
1, 2, 3 (EXPE = 1) with Off
Off
Off
ABW in WSCR = 0
1, 2, 3 (EXPE = 1) with Off
Off
ABW in WSCR = 1, and
2, 3 (EXPE = 0)
On/Off
Legend:
Off: MOS input pull-up is always off.
On/Off: On when PBDDR = 0 and PBODR = 1; otherwise off.
In Other
Operations
Off
On/Off
8.13 Additional Overview for H8S/2169
The H8S/2169 has fifteen I/O ports (ports 1 to 6, 8, 9, A, B, C, D, E, F, and G), and one input-only
port (port 7).
Table 8.26 is a summary of the additional port functions. As the functions of ports 1 to 9, A, and
B are the same on the H8S/2149, table 8.1 provides a summary.
Each extra port includes a data direction register (DDR) that controls input/output, and data
registers (ODR) for storing output data.
Ports C, D, E, F, and G have a built-in MOS input pull-up function. On ports C, D, E, F, and G,
whether the MOS input pull-up is on or off is controlled by the corresponding DDR and ODR.
Ports C, D, E, F, and G can drive a single-TTL load and 30-pF-capacitive load. All I/O port pins
are capable of driving a Darlington transistor when they are in output mode.
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