M30218 Datasheet, PDF (69/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

FLD controller
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Toff section generate/not generate 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. In case the continuous data output to each FLD ports, the Toff1
section of the continuous parts is not generated. (See Figure KA-15)
If it needs Toff1 section on FLD pulses, set “CMOS ports: section of Toff generate / not generate bit” to “1”
and set “high-breakdown-voltage ports: section of Toff generate / not generate bit” to “1”. High-breakdown-
voltage ports (P5, P6, P3, P2, P1, P0, P40 to P43, total 52 pins) generate Toff1 section, by setting “high-
breakdown-voltage ports: section of Toff generate / not generate bit” to “1”.
The CMOS ports ( P44 to P47, total 4 pins ) generate Toff1 section, by setting “high-breakdown-voltage
ports: section of Toff generate / not generate bit” to “1”.
Toff1
Output waveform when “high-
breakdown-voltage ports: section of Toff
generate/not generate bit”(bit 6 of 03511
6) is “1”.
P1X
P2X
Tdisp
“H” output
“H” output
“L” output
“H” output
“H” output
“L” output
“H” output
“H” output
P1X
Output waveform when “high-
breakdown-voltage ports: section of Toff
generate/not generate bit”(bit 6 of 035116)
is “0”.
P2X
“H” output
“H” output
“L” output
“H” output
“H” output
Section of Toff1 is not generated because of output is same.
“H” output
“L” output
“H” output
Section of Toff1 is not generated because of output is same.
Fig. KA-15. Toff Section Generated/not generated Function
Toff2 SET/RESET change bit
In gradation display mode, the values set by the Toff2 time set register (TOFF2) are effective. When the
FLD output control register (bit 7 of address 035116 ) in the initial state = “0”, RAM data is output to the FLD
output ports (SET) at the time that is set by TOFF1 and is turned to “0” (RESET) at the time that is set by
TOFF2. When bit 7 = “1”, RAM data is output (SET) at the time that is set by TOFF2 and is turned to “0”
(RESET) when the Tdisp time expires.
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