SH7670 Datasheet, PDF (375/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 9 Clock Pulse Generator (CPG)
9.3 Clock Operating Modes
Table 9.2 shows the relationship between the combinations of the mode control pins (MD_CK1
and MD_CK0) and the clock operating modes. Table 9.3 shows the usable frequency ranges in the
clock operating modes.
Table 9.2 Clock Operating Modes
Pin Values
Mode MD_CK1 MD_CK0
0
0
0
1
0
1
Clock I/O
Divider PLL Circuit
Source
Output 2
On/Off
EXTAL or
crystal
resonator
CKIO 1
ON (× 8, 12)
EXTAL
CKIO 1/2
ON (× 8, 12)
2
1
0
CKIO

1/4
ON (× 8, 12)
3
1
1
USB_X1 or CKIO 1/2
ON (× 8)
crystal
resonator
CKIO Frequency
(EXTAL or crystal
resonator) × 4
(EXTAL or crystal
resonator) × 2
(CKIO)
(USB_X1 or crystal
resonator) × 2
• Mode 0
In mode 0, clock is input from the EXTAL pin or the crystal resonator. The PLL circuit shapes
waveforms and the frequency is multiplied according to the frequency control register setting
before the clock is supplied to the LSI. The oscillating frequency for the crystal resonator and
EXTAL pin input clock ranges from 15 to 25 MHz*. The frequency range of CKIO is from 60
to 100 MHz*. To reduce current supply, pull up the USB_X1 pin and open the USB_X2 pin
when USB is not used.
Note: * These are target values that were set when we prepared this hardware manual. We will
determine the guaranteed maximum frequencies after the final evaluation result of this
LSI is obtained.
• Mode 1
In mode 1, clock is input from the EXTAL pin. The PLL circuit shapes waveform and the
frequency is multiplied according to the frequency control register setting before the clock is
supplied to the LSI. The oscillating frequency for the EXTAL pin input clock ranges from 30*
to 50 MHz*. The frequency range of CKIO is from 60 to 100 MHz*. To reduce current supply,
pull up the USB_X1 pin and open the USB_X2 pin when USB is not used.
Note: * These are target values that were set when we prepared this hardware manual. We will
determine the guaranteed maximum frequencies after the final evaluation result of this
LSI is obtained.
Rev. 1.00 Nov. 14, 2007 Page 349 of 1262
REJ09B0437-0100