SH7263 Datasheet, PDF (138/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 4 Clock Pulse Generator (CPG)
4.3 Clock Operating Modes
Table 4.2 shows the relationship between the combinations of the mode control pins (MD_CLK1
and MD_CLK0) and the clock operating modes. Table 4.3 shows the usable frequency ranges in
the clock operating modes.
Table 4.2 Clock Operating Modes
Pin Values
Clock I/O
Mode MD_CLK1 MD_CLK0 Source Output Divider 1
0
0
0
EXTAL or CKIO 1
crystal
resonator
1
0
1
EXTAL or CKIO 1/2
crystal
resonator
2
1
0
CKIO
⎯
1/4
3
1
1
USB_X1 or CKIO 1/4
crystal
resonator
PLL Circuit
On/Off
ON
(× 8, 12, 16)
ON
(× 8, 12, 16)
ON
(× 8, 12, 16)
ON
(× 8, 12, 16)
CKIO
Frequency
(EXTAL or
crystal
resonator) × 4
(EXTAL or
crystal
resonator) × 2
(CKIO)
(USB_X1 or
crystal
resonator)
• Mode 0
In mode 0, clock is input from the EXTAL pin or the crystal oscillator. 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 10 to 16.67 MHz. The frequency range of CKIO is from
40 to 66.66 MHz. To reduce current consumption, fix the USB_X1 pin (pull up, pull down,
connect to power supply, or connect to ground) and open the USB_X2 pin when USB is not
used.
• Mode 1
In mode 1, clock is input from the EXTAL pin or the crystal oscillator. 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 crystal resonator and
EXTAL pin input clock ranges from 20 to 33.33 MHz. The frequency range of CKIO is from
40 to 66.66 MHz. To reduce current consumption, fix the USB_X1 pin (pull up, pull down,
connect to power supply, or connect to ground) and open the USB_X2 pin when USB is not
used.
Rev. 2.00 Mar. 14, 2008 Page 104 of 1824
REJ09B0290-0200