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M38B71M1 Datasheet(PDF) 60 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) 60 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
59
Fig. 59 Digit pulses output function
Digit Pulses Output Function
P00 to P07 and P20 to P27 can output digit pulses by using the
digit output set switch registers. Set the digit output set switch reg-
isters by setting as many consecutive 1s as the timing count from
P20. The contents of FLD automatic display RAM for the ports that
have been selected for digit output are disabled, and the pulse
shown in Figure 59 is output automatically.
The output timing consists of Tdisp time and Toff1 time, and Toff2
time does not exist.
Because the contents of FLD automatic display RAM are dis-
abled, the segment data can be changed easily even when
segment data and digit data coexist at the same address in the
FLD automatic display RAM.
This function is effective in 16-timing•ordinary mode and 16-timing
gradation display mode. If a value is set exceeding the timing
count (FLD data pointer reload register’s set value + 1) for any
port, the output of such port is “L”.
Low-order 4bits
of the data pointer
FE
D
C
B
A
0
1
2
3
4
5
6
7
8
9
P07
P06
P05
P04
P03
P02
P01
P00
P27
P26
P25
P24
P23
P22
P21
P20
Tdisp
Toff1


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