SH7618 Datasheet, PDF (229/646 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

Section 8 Clock Pulse Generator (CPG)
Mode 1: The frequency of the external clock input from the EXTAL pin is quadrupled by PLL
circuit 2, and then the clock is supplied to this LSI. Since the input clock frequency ranging 10
MHz to 12.5 MHz can be used, the CKIO frequency ranges from 40 MHz to 50 MHz.
Mode 2: The frequency of the on-chip crystal oscillator output is quadrupled by PLL circuit 2, and
then the clock is supplied to this LSI. Since the crystal resonator frequency ranging 10 MHz to
12.5 MHz can be used, the CKIO frequency ranges from 40 MHz to 50 MHz.
Mode 5: The frequency of the external clock from the EXTAL pin is doubled by PLL circuit 2,
and then the clock is supplied to this LSI. Since the input clock frequency ranging 10 MHz to 25
MHz, the CKIO frequency ranges from 20 MHz to 50 MHz.
Mode 6: The frequency of the on-chip crystal oscillator output is doubled by PLL circuit 2, and
then the clock is supplied to the LSI. Since the crystal oscillation frequency ranging 10 MHz to 25
MHz can be used, the CKIO frequency ranges from 20 MHz to 50 MHz.
Table 8.3 Possible Combination of Clock Modes and FRQCR Values
Mode
FRQCR
Register
Value
PLL
Circuit 1
PLL
Circuit 2
1 or 2 H'1000 ON (×1) ON (×4)
H'1001 ON (×1) ON (×4)
H'1003 ON (×1) ON (×4)
H'1101 ON (×2) ON (×4)
H'1103 ON (×2) ON (×4)
5 or 6 H'1000 ON (×1) ON (×2)
H'1001 ON (×1) ON (×2)
H'1003 ON (×1) ON (×2)
H'1101 ON (×2) ON (×2)
H'1103 ON (×2) ON (×2)
Note: * Input clock is assumed to be 1.
Clock Ratio*
(I:B:P)
4:4:4
4:4:2
4:4:1
8:4:4
8:4:2
2:2:2
2:2:1
2:2:1/2
4:2:2
4:2:1
Input Clock
Frequency Range
10 MHz to
12.5 MHz
10 MHz to
25 MHz
CKIO Pin
Frequency
Range
40 MHz to
50 MHz
20 MHz to
50 MHz
Rev. 6.00 Jun. 12, 2007 Page 197 of 610
REJ09B0131-0600