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7630 Datasheet(PDF) 93 Page - Renesas Technology Corp

Part # 7630
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  238 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7630 Datasheet(HTML) 93 Page - Renesas Technology Corp

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APPLICATION
2.3 Timers
2-27
7630 Group User’s Manual
Fig. 2.3.12 Setting of related registers [Measurement of frequency] (1)
b0
b7
CPUM
CPU mode register [Address: 000016]
0
Internal system clock selection bit :
φ = f(XIN) divided by 2
(high-speed mode)
Timer X mode bits : Event counter mode
b0
b7
TXL
Timer XL [Address: 001A16]
FF16
Set to “00FF16” before counting a pulse.
(After being started, the timer decrements with each input pulse.)
b0
b7
TXM
Timer X mode register [Address: 001E16]
0
10
Timer X data write control bit : Write to latch and timer
at the same time.
11
CNTR0 polarity selection bit : Count at falling edge
Timer X stop control bit : Stop counting
(Clear this bit to “0” to start counting.)
Timer Y operation bits : Timer mode
b0
b7
TYM
Timer Y mode register [Address: 001F16]
1
0
10
Timer Y stop control bit : Stop counting
(Clear this bit to “0” to start counting.)
Timer Y count source selection bits :
φ divided by 8
0
b0
b7
Timer XH [Address: 001B16]
0016
TXH
b0
b7
TYL
Timer YL [Address: 001C16]
E716
b0
b7
Timer YH [Address: 001D16]
0316
TYH
Set to “division ratio – 1” to generate underflow
every 2 ms at f(XIN) = 8 MHz.



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