SH7710 Datasheet, PDF (357/996 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 11 On-Chip Oscillation Circuits
11.2.2 Input/Output Pins
Table 11.1 lists the CPG pins and their functions.
Table 11.1 Pin Configuration
Pin Name
Abbreviation I/O Description
Mode control pins MD0
I Set the clock operating mode.
MD1
I Set the clock operating mode.
MD2
I Set the clock operating mode.
Crystal oscillator XTAL
pins (clock input _EXTAL
pins)
O Connects a crystal oscillator.
I Connects a crystal oscillator. Also used to input an
external clock.
Clock I/O pin
CKIO
IO Inputs or outputs an external clock.
Clock output pin CKIO2
O Outputs an external clock.
Note: To prevent device malfunction, the value of the mode control pin is sampled only by a
power-on reset.
11.3 Clock Operating Modes
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
Pin Values
Mode MD2 MD1 MD0
0
0
0
0
1
0
0
1
2
0
1
0
4
1
0
0
Clock I/O
Source Output
EXTAL CKIO
CKIO2
EXTAL CKIO
CKIO2
Crystal CKIO
resonator _CKIO2
Crystal CKIO
resonator _CKIO2
PLL2
On/Off
ON
(x 1)
ON
(x 4)
ON
(x 4)
ON
(x 1)
PLL1
On/Off
ON
(x 1, 2, 3)
ON
(x 1, 2, 3)
ON
(x 1, 2, 3)
ON
(x 1, 2, 3)
CKIO
Frequency
(EXTAL)
(EXTAL) x 4
(Crystal) x 4
(Crystal)
Rev. 2.00 Dec. 07, 2005 Page 315 of 950
REJ09B0079-0200