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参数资料
型号： M38B79FFFP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 4.2 MHz, MICROCONTROLLER, PQFP100
封装： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件页数： 70/112页
文件大小： 1862K
代理商： M38B79FFFP
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
57
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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