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7643 bảng dữ liệu(PDF) 318 Page - Renesas Technology Corp

tên linh kiện 7643
Giải thích chi tiết về linh kiện  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  424 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7643 bảng dữ liệu(HTML) 318 Page - Renesas Technology Corp

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Rev.2.00
Aug 28, 2006
page 197 of 202
7643 Group
REJ09B0133-0200
APPLICATION
2.10 Clock generating circuit
Control procedure: Set the relevant registers in the order shown below to prepare for a power
failure.
Fig. 2.10.11 Control procedure
Initialization
CCR (address 1F16)
CPMA (address 0016)
100000002
00011XXX2
CPMA (address 0016), bit 7
CPMA (address 0016), bit5
1 (Note)
1 (Note)
RESET
f(XCIN) (low-speed mode) selected as internal system
clock
Main clock f(XIN) oscillation stopped
Note: Do not switch simultaneously.
Return processing from power failure
Set timer interrupt to occurs every second.
Execute WIT instruction.
At power failure, clock count is performed during
timer interrupt processing (every second).
When selecting main clock f(XIN) (high-speed mode)
Detect power failure ?
N
Y
Return condition from power failure
completed ?
N
Y
qX: This bit is not used here. Set it to “0” or “1” arbitrarily.



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