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Rev. 5.00, 09/03, page 211 of 760
9.4 Register Descriptions
9.4.1 Frequency Control Register (FRQCR)
The frequency control register (FRQCR) is a 16-bit readable/writable register used to specify 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.
FRQCR is initialized to H'0102 by a power-on reset, but retains its value in a manual reset and in
standby mode.
FRQCR:
Bit: 15 14 13 12 11 10 9 8
STC2IFC2PFC2—————
Initial value:00000001
R/W:R/WR/WR/WRRRRR
Bit:76543210
— — STC1 STC0 IFC1 IFC0 PFC1 PFC0
Initial value:00000010
R/W: R R R/W R/W R/W R/W R/W R/W
Bits 15, 5, and 4—Frequency Multiplication Ratio (STC): These bits specify the frequency
multiplication ratio of PLL circuit 1.
Bit 15: STC2 Bit 5: STC1 Bit 4: STC0 Description
000× 1 (Initial value)
001× 2
100× 3
010× 4
101× 6
Except above value Reserved