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H838532H bảng dữ liệu(PDF) 280 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
PDF  508 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H838532H bảng dữ liệu(HTML) 280 Page - Renesas Technology Corp

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Section 9 Timers
Rev. 1.00 May 30, 2008 Page 260 of 484
REJ09B0436-0100
9.5.5
Application Notes
(1) Internal Clock Switching and TCG Operation
Depending on the timing, TCG may be incremented by a switch between difference internal clock
sources. Table 9.14 shows the relation between internal clock switchover timing (by write to bits
CKS1 and CKS0) and TCG operation.
When TCG is internally clocked, an increment pulse is generated on detection of the falling edge
of an internal clock signal, which is divided from the system clock (
φ) or subclock (φw). For this
reason, in a case like No. 3 in table 9.14 where the switch is from a high clock signal to a low
clock signal, the switchover is seen as a falling edge, causing TCG to increment.
Table 9.14
Internal Clock Switching and TCG Operation
No.
Clock Levels Before and
After Modifying Bits CKS1
and CKS0
TCG Operation
1
Goes from low level to low level
Clock before
switching
Clock after
switching
Count
clock
TCG
N
N+1
Write to CKS1 and CKS0
2
Goes from low level to high level
Clock before
switching
Clock before
switching
Count
clock
TCG
N
N+1
N+2
Write to CKS1 and CKS0



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