HD4046212RFS datasheet(59/157 Pages) RENESAS

tên linh kiện	HD4046212RFS

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HD404629R Series

Pull-Up MOS Transistor Control: A program-controlled pull-up MOS transistor is provided for each

input/output pin other than input-only pins D

10 and D11.

The on/off status of all these transistors is

controlled by bit 3 (MIS3) of the miscellaneous register (MIS: $00C), and the on/off status of an individual

transistor can also be controlled by the port data register (PDR) of the corresponding pin—enabling on/off

control of that pin alone (table 23 and figure 41).

The on/off status of each transistor and the peripheral function mode of each pin can be set independently.

How to Deal with Unused I/O Pins: I/O pins that are not needed by the user system (floating) must be

connected to V

CC to prevent LSI malfunctions due to noise.

These pins must either be pulled up to V

CC by

their pull-up MOS transistors or by resistors of about 100 k

Ω.

Bit

Initial value

Read/Write

Bit name

MIS3

MIS2

MIS0

MIS1

MIS2

CMOS buffer

on/off selection

for pin R23 /SO

Miscellaneous register (MIS: $00C)

Off

Refer to figure 18 in the

operation modes section.

tRC selection.

MIS3

Pull-up MOS

on/off selection

Off

MIS1

MIS0

Figure 41 Miscellaneous Register (MIS)

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