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Section 4 Clock Pulse Generator (CPG)
Rev. 4.00 Sep. 14, 2005 Page 149 of 982
REJ09B0023-0400
4.4 Register
Descriptions
The CPG's control register is called the frequency control register (FRQCR). Refer the section 24,
List of Registers, for the addresses of the registers and the state of each register in each processor
state.
4.4.1
Frequency Control Register (FRQCR)
The frequency control register (FRQCR) is a 16-bit readable/writable register used to specify
whether a clock is output from the CKIO pin, the frequency multiplication ratio of PLL circuit 1,
and the frequency division ratio of the internal clock and the peripheral clock.
Only word access can be used on the FRQCR register.
This register is initialized (to H'1003) only in the case of a power-on reset. This register retains its
previous value after a manual reset or period in standby mode. The previous value is also retained
when an internal reset is triggered by an overflow of the WDT.
Bit Bit
Name
Initial
Value R/W Description
15 to 13
All
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
12
CKOEN
1
R/W
Clock Output Enable
CKOEN specifies whether a clock is output from the
CKIO and CKIO2 pins, or whether the CKIO and
CKIO2 pins is placed in the level-fixed state during
release of the standby mode (until the state enters
STATUS1 = L and STATUS0 = L from an interrupt). If
CKOEN is cleared to 0, the CKIO and CKIO2 pins are
fixed at low during STATUS1 = L and STATUS0 = H.
Therefore, the malfunction of an external circuit
because of an unstable CKIO clock during release of
the standby mode can be prevented. In clock
operating mode 7, the CKIO pin functions as an input
regardless of this bit value.
0: The CKIO pin is fixed to the low level in the standby
mode and while the system is leaving standby
mode.
1: Clock is output from CKIO pin (placed in the high-
impedance state during periods in standby mode).
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
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Страница 1036: ...SH7641 Hardware Manual...