M30218 Datasheet, PDF (68/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

FLD controller
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
P44 to P47 Expansion Function
P44 to P47 are CMOS output-type ports. FLD digit outputs can be increased as many as 16 lines by con-
necting a 4-bit to 16-bit decoder to these ports. P44 to P47 have the function to allow for connection to a 4-
bit to 16-bit decoder.
(1) P44 to P47 Toff invalid Function
This function disables the Toff1 time and Toff2 time and outputs display data for the duration of Tdisp.
(See Figure KA-13.) This can be accomplished by setting the P44 to P47 Toff disable bit (address 035016
bit 2) to “1”.
Unlike the Toff section generate/not generate function, this function disables all display data.
(2) Dimmer signal output Function
This function allows a dimmer signal creation signal to be output from DIMOUT (P97). The dimmer function
can be materialized by controlling the decoder with this signal. (See Figure KA-13.) This function can be
set by writing P97 dimmer output control bit (bit 4 of address 035116) to “1”.
(3) P44 to P47 FLD Output Reverse Bit
P44 to P47 are provided with a function to reverse the polarity of the FLD output. This function is useful in
adjusting the polarity when using an externally installed driver.
The output polarity can be reversed by setting bit 0 of the FLD output control register (address 035116) to
“1” .
•Grayscale display mode is not selected
•Grayscale display mode is selected and
set for bright display
(grayscale display control data = “0”)
FLD output
•Grayscale display mode is selected and
set for dark display
(grayscale display control data = “1”)
•Grayscale display mode is selected and
Toff2 SET/RESET bit is “1”
(grayscale display control data = “1”)
Toff1
Toff2
Tdisp
Output selecting P44 to P47
Toff invalid
For dimmer signal
DIMOUT(P97)
Figure KA-13. P4 to P47 FLD Output pulses
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