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M38B71M1 Datasheet(PDF) 59 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 59 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
58
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
“H” output
“H” output
“H” output
“H” output
“H” output
“H” output
“H” output
“H” output
“H” output
“H” output
“L” output
“L” output
“L” 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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