38B7 datasheet(59/110 Pages) RENESAS

59 / 110 page

38B7 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Toff2 SET/RESET Switch Function

In gradation display mode, the values set by the Toff2 time set reg-

ister (TOFF2) are effective. When the Toff2 SET/RESET switch bit

of FLD output control register (bit 7 of address 0EFC16) is “0”,

RAM data is output to the FLD output ports (SET) at the time that

is set by TOFF1 and it is turned to “0” (RESET) at the time that is

set by TOFF2.

When Toff2 SET/RESET switch bit is “1”, RAM data is output

(SET) at the time that is set by TOFF2 and it is turned to “0” (RE-

SET) when the Tdisp time expires.

s Note

In the case of gradation display mode and dark display, the Toff

section generate/nothing function is disabled.

Toff Section Generate/Nothing Function

The function is for reduction of useless noises which generated as

every switching of ports, because of the combined capacity of

among FLD ports. When the continuous data is output to each

FLD port, the Toff1 section of the continuous parts is not gener-

ated. (See Figure 58)

Fig. 58 Toff section generating/nothing function

If it needs Toff1 section on FLD pulses, set the generating /not of

CMOS port Toff section selection bit (bit 5 of address 0EFC16) to

“1” and set the generating /not of high-breakdown-voltage port Toff

section selection bit to “1”.

High-breakdown-voltage ports (P2, P0, P1, P3, P4, P5, P63 to

P60, total 52 pins) generate Toff1 section by setting the generating

/not of high-breakdown-voltage port Toff section selection bit to

“1”.

The CMOS ports (P64 to P67, total 4 pins ) generate Toff1 section

by setting the generating /not of CMOS port Toff section selection

bit to “1”.

P1X

P2X

P1X

P2X

“H” output

Tdisp

Toff1

Section of Toff1 is not generated because of output is the same.

Output waveform when

generating/not of high-breakdown

voltage port Toff section selection

bit (bit 6 of address 0EFC16) is “1”.

“H” output

“L” output

Section of Toff1 is not generated because of output is the same.

Output waveform when

generating/not of high-breakdown

voltage port Toff section selection

bit (bit 6 of address 0EFC16) is “0”.

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