參數資料
型號: M38279EFFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數: 32/70頁
文件大?。?/td> 1112K
代理商: M38279EFFP
38
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3827 Group
MITSUBISHI MICROCOMPUTERS
Common Pin and Duty Ratio Control
The common pins (COM0–COM3) to be used are determined by
duty ratio.
Select duty ratio by the duty ratio selection bits (bits 0 and 1 of the
LCD mode register).
When releasing from reset, the VCC (VL3) voltage is output from
the common pins.
Table 9 Duty ratio control and common pins used
Duty
ratio
Common pins used
Notes1: COM2 and COM3 are open.
2: COM3 is open.
Bit 1
Bit 0
COM0, COM1 (Note 1)
Duty ratio selection bit
2
3
4
0
1
0
1
COM0–COM2 (Note 2)
COM0–COM3
Segment Signal Output Pin
Segment signal output pins are classified into the segment-only
pins (SEG0–SEG17), the segment/output port pins (SEG18
SEG25), and the segment/I/O port pins (SEG26–SEG39).
Segment signals are output according to the bit data of the LCD
RAM corresponding to the duty ratio. After reset release, a VCC
(=VL3) voltage is output to the segment-only pins and the seg-
ment/output port pins are pulled up to the VCC (=VL3) voltage in
the high impedance condition. The segment/I/O port pins are set
to input ports, and VCC (=VL3) is applied to them by pull-up resis-
tor.
LCD Display RAM
Address 004016 to 005316 is the designated RAM for the LCD dis-
play. When “1” are written to these addresses, the corresponding
segments of the LCD display panel are turned on.
LCD Drive Timing
The LCDCK timing frequency (LCD drive timing) is generated in-
ternally and the frame frequency can be determined with the
following equation;
f(LCDCK) =
Frame frequency =
Fig. 41 LCD display RAM map
(frequency of count source for LCDCK)
(divider division ratio for LCD)
f(LCDCK)
(duty ratio)
Bit
address
76
5
432
1
0
004016
004116
004216
004316
004416
004516
004616
SEG1
SEG3
SEG5
SEG7
SEG9
SEG0
SEG2
SEG4
SEG6
SEG8
SEG10
COM3 COM2 COM1 COM0
SEG12
SEG14
SEG16
SEG18
SEG20
SEG22
SEG24
SEG26
SEG28
SEG30
SEG32
SEG34
SEG36
SEG38
SEG21
SEG23
SEG25
SEG27
SEG11
SEG13
SEG15
SEG17
SEG19
SEG29
SEG31
SEG33
SEG35
SEG37
SEG39
004716
004816
004916
004A16
004B16
004C16
004D16
004E16
004F16
005016
005116
005216
005316
COM3 COM2 COM1 COM0
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