M38B71M1 datasheet(58/110 Pages) RENESAS | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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38B7 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

P64 to P67 Expansion Function

Ports P64 to P67 are CMOS output structure. FLD digit outputs

can be increased as many as 16 lines by connecting a decoder

converting 4-bit to 16-bit data to these ports. P64 to P67 have the

function to allow for connection to a decoder converting 4-bit to

16-bit data.

(1) P64 to P67 Toff invalid function

This function disables the Toff1 time and Toff2 time and outputs

display data for the duration of Tdisp. (See Figure 57.) This can be

achieved by setting the P64 to P67 Toff invalid bit (bit 2 of address

0EFC16) to “1”.

(2) Dimmer signal output function

This function allows a dimmer signal creation signal to be output

from DIMOUT (P73). The dimmer function can be achieved by con-

trolling the decoder with this signal. (See Figure 57.) This function

can be set by setting P73 dimmer output control bit (bit 4 of ad-

dress 0EFC16) to “1”.

Unlike the Toff section generating/nothing function, this function

disables all display data.

Fig. 57 P64 to P67 FLD output pulses

(3) P64 to P67 FLD output reverse function

P64 to P67 have the function to reverse the polarity of the FLD out-

put. This function is useful in adjusting the polarity when using an

externally installed driver.

The output polarity can be reversed by setting the P64 to P67 out-

put reverse bit of the FLD output control register (bit 0 of address

0EFC16) to “1”.

s Note

In the case of gradation display mode and dark display, P64 to P67

Toff invalid function is disabled.

Tdisp

Toff2

Toff1

For dimmer signal

DIMOUT (P73)

FLD output

•Gradation display mode is not selected

•Gradation display mode is selected and

set for bright display

(gradation display control data = “0”)

•Gradation display mode is selected and

set for dark display

(gradation display control data = “1”)

•Gradation display mode is selected and

Toff2 SET/RESET switch bit is “1”

(gradation display control data = “1”)

Output selecting P64 to P67

Toff invalid

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