Section 3 Oscillator Circuits and Operating Modes
Rev. 2.00 Mar 09, 2006 page 114 of 906
REJ09B0292-0200
3.2.5
Operating Frequency Selection by Register
Using the frequency modification register (FMR), it is possible to specify the operating frequency
division ratio for the internal clocks (I
φ
, E
φ
, P
φ
). The internal clock frequency is determined under
the control of PLL circuits 1 and 2 and dividers DIVM, DIVE, and DIVP.
Frequency Modification Register (FMR):
The frequency modification register is initialized only
by a power-on reset via the
RES
pin, and not by an internal reset resulting from WDT overflow.
Its initial value depends on the settings of pins MD2–MD0. Table 3.4 shows the relationship
between the MD2–MD0 pin combinations and the initial value of the frequency modification
register.
Table 3.4
Relationship between Clock Mode Pin Settings and Initial Value of Frequency
Modification Register
Clock Mode
MD2
MD1
MD0
Initial Value
Mode 0
0
0
0
H'00
Mode 1
0
0
1
Mode 2
0
1
0
H'40
Mode 3
0
1
1
H'60
Mode 4
1
0
0
H'A6
Mode 5
1
0
1
Mode 6
1
1
0
H'E0
The register configuration is shown in table 3.5.
Table 3.5
Register Configuration
Name
Abbreviation
R/W
Initial Value
Address
Frequency modification register
FMR
R/W
See table 3.4
*
H'FFFFFE90
Note:
*
The initial value depends on the clock mode.
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...