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H8S/2214 数据表(PDF) 442 Page - Renesas Technology Corp

部件名 H8S/2214
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2214 数据表(HTML) 442 Page - Renesas Technology Corp

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Section 10 16-Bit Timer Pulse Unit (TPU)
Rev.4.00 Sep. 18, 2008 Page 382 of 872
REJ09B0189-0400
Bit 7—Count Direction Flag (TCFD): Status flag that shows the direction in which TCNT
counts in channels 1 and 2.
In channel 0, bit 7 is reserved. It is always read as 1 and cannot be modified.
Bit 7
TCFD
Description
0
TCNT counts down
1
TCNT counts up
(Initial value)
Bit 6—Reserved: Read-only bit, always read as 1 and cannot be modified.
Bit 5—Underflow Flag (TCFU): Status flag that indicates that TCNT underflow has occurred
when channels 1and 2 are set to phase counting mode.
In channel 0, bit 5 is reserved. It is always read as 0 and cannot be modified.
Bit 5
TCFU
Description
0
[Clearing condition]
(Initial value)
• When 0 is written to TCFU after reading TCFU = 1
1
[Setting condition]
• When the TCNT value underflows (changes from H'0000 to H'FFFF)
Bit 4—Overflow Flag (TCFV): Status flag that indicates that TCNT overflow has occurred.
Bit 4
TCFV
Description
0
[Clearing condition]
(Initial value)
• When 0 is written to TCFV after reading TCFV = 1
1
[Setting condition]
• When the TCNT value overflows (changes from H'FFFF to H'0000 )



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