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M38B71M1 Datasheet(PDF) 44 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) 44 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
43
FLD CONTROLLER
The M38B7 group has fluorescent display (FLD) drive and control
circuits.
Table 9 shows the FLD controller specifications.
Specifications
• 52 pins (20 pins can be switched to general-purpose ports)
• 4 pins (all 4 pins can be switched to general-purpose ports)
(A driver IC must be installed externally)
• Used FLD output
28 segment ✕ 28 digit (segment number + digit number
≤ 56)
• Used digit output
40 segment ✕ 16 digit (segment number
≤ 40, digit number ≤ 16)
• Connected to M35501
56 segment ✕ (connected number of M35501) digit
(segment number
≤ 56, digit number ≤ number of M35501 ✕ 16)
• Used P64 to P67 expansion
52 segment ✕ 16 digit (segment number
≤ 52, digit number ≤ 16)
• 4.0
µs to 1024 µs (count source XIN/16, 4 MHz)
• 16.0
µs to 4096 µs (count source XIN/64, 4 MHz)
• 4.0
µs to 1024 µs (count source XIN/16, 4 MHz)
• 16.0
µs to 4096 µs (count source XIN/64, 4 MHz)
• Digit interrupt
• FLD blanking interrupt
• Key-scan using digit
• Key-scan using segment
• Digit pulse output function
This function automatically outputs digit pulses.
• M35501 connection function
The number of digits can be increased easily by using the output of DIMOUT(P73) as CLK for the
M35501.
• Toff section generating/nothing function
This function does not generate Toff1 section when the connected outputs are the same.
• Gradation display function
This function allows each segment to be set for dark or bright display.
• P64 to P67 expansion function
This function provides 16 lines of digit outputs from four ports by attaching the decoder converting
4-bit data to 16-bit data.
Item
FLD
controller
port
High-breakdown-
voltage output port
CMOS port
Display pixel number
Period
Dimmer time
Interrupt
Key-scan
Expanded function
Table 9 FLD controller specifications


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