HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 520

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 11
11.3
Table 11.2 shows the relationship between the mode control pins (MD2 to MD0) combinations
and the clock modes. Table 11.3 shows the available combinations of the values of the clock
modes and frequency control register (FRQCR).
Table 11.2 Clock Operating Modes
Mode 0: The LSI is supplied with a clock that is wave-formed by PLL circuit 2 after receiving an
Mode 1: The clock supplied to the internal circuitry in the LSI is generated by PLL circuit 2
Mode 2: The clock is generated by an on-chip crystal oscillator, and its frequency is quadrupled by
Mode 7: The CKIO pin works as an input pin in this mode. The frequency of the external clock
Rev. 3.00 Jan. 18, 2008 Page 458 of 1458
REJ09B0033-0300
0
1
2
7
Mode MD2
0
0
0
1
external clock from the EXTAL pin. The frequency of CKIO ranges from 24.00 to 66.67
MHz, because the input clock frequency ranges from 24.00 to 66.67 MHz.
quadrupling the frequency after receiving an external clock from the EXTAL pin.
Therefore, the frequency of a clock generated outside the LSI can be lower. The
frequency of CKIO ranges from 40.00 to 66.67 MHz, because an input clock with a
frequency range of 10.00 to 16.67 MHz is used.
PLL circuit 2. Therefore, the frequency of a clock generated outside the LSI can be lower.
The frequency of CKIO ranges from 40.00 to 66.67 MHz, because a crystal oscillator with
a frequency range of 10.00 to 16.67 MHz is used.
supplied to the LSI is multiplied by the setting ratio after the external clock is input via the
CKIO pin and wave-formed by PLL circuit 1. This mode is suitable for connecting a
synchronous DRAM, because the change in the load in the CKIO pin is controlled by PLL
circuit 1.
Clock Operating Modes
Clock Pulse Generator (CPG)
Pin Values
0
0
1
1
MD1
0
1
0
1
MD0
EXTAL
EXTAL
Crystal
resonator
CKIO
Source
Clock I/O
CKIO
CKIO
CKIO

Output
PLL2
On/Off
ON
(x 1)
ON
(x 4)
ON
(x 4)
OFF
PLL1
On/Off
ON
(x 1, 2, 3, 4)
ON
(x 1, 2, 3, 4)
ON
(x 1, 2, 3, 4)
ON
(x 1, 2, 3, 4)
CKIO
Frequency
(EXTAL)
(EXTAL) x 4
(Crystal) x 4
(CKIO)