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H8SX/1663R Datasheet(PDF) 881 Page - Renesas Technology Corp

Part # H8SX/1663R
Description  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1504 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX/1663R Datasheet(HTML) 881 Page - Renesas Technology Corp

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Section 17 32K Timer (TM32K)
Rev. 2.00 Sep. 24, 2008 Page 849 of 1468
REJ09B0412-0200
17.3
Operation
17.3.1
Basic Operation
Either 8-bit or 24-bit counter operation can be selected for the timer counter.
Setting 1 to the TME bit in TCR32K starts the count-up operation.
A 32K timer interrupt (32KOVI) is generated by the interrupt cycle. Table 17.1 shows
relationships between the timer counter operations according to the setting of bits EXCKSN,
CKS1, and CKS0 in TCR32K and the interrupt cycles.
Table 17.1
Relationships between Counter Operations and 32KOVI Cycles
Setting
Division
Ratio
Selected Counter Interrupt Cycles
EXCKSN CKS1 CKS2
Internally
Divided CLK
TCNT
32K1
TCNT
32K2
TCNT
32K3
Counter value
when interrupt
generates
32KOVI Cycle
1
0
0
SUBCK/32
√
−
−
250 ms
1
0
1
SUBCK/64
√
−
−
500 ms
1
1
0
SUBCK/128
√
−
−
1 s
1
1
1
SUBCK/256
√
−
−
TCNT32K1=H'FF
2 s
0
0
0
SUBCK/16384
√
√
√
30 s
0
0
1
SUBCK/32768
√
√
√
TCNT32K3=H'3B
60 s
0
1
0
SUBCK/16384
√
√
√
Approx. 22.7
days
0
1
1
SUBCK/32768
√
√
√
TCNT32K1 to 3
=H'FFF3B
Approx. 45.5
days
√ : in use
− : not in use



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