Rev. 2.00, 09/03, page 275 of 690
9.3
Clock Operating Modes
Table 9.2 shows the relationship between the mode control pins (MD2 to MD0) combinations and
the clock operating modes. Table 9.3 shows the usable frequency ranges in the clock operating
modes and the frequency range of the input clock.
Table 9.2
Clock Operating Modes
Pin Values
Clock I/O
Mode
MD2
MD1
MD0
Source
Output
PLL2
On/Off
PLL1
On/Off
CKIO
Frequency
0
0
0
0
EXTAL
CKIO
ON (
×
1)
ON (
×
1, 2, 3, 4)
(EXTAL)
1
0
0
1
EXTAL
CKIO
ON (
×
4)
ON (
×
1, 2, 3, 4)
(EXTAL)
×
4
2
0
1
0
Crystal
resonator
CKIO
ON (
×
4)
ON (
×
1, 2, 3, 4)
(Crystal)
×
4
4
1
0
0
Crystal
resonator
CKIO
ON (
×
1)
ON (
×
1, 2, 3, 4)
(Crystal)
5
1
0
1
EXTAL
CKIO
ON (
×
2)
ON (
×
1, 2, 3, 4)
(EXTAL)
×
2
6
1
1
0
Crystal
resonator
CKIO
ON (
×
2)
ON (
×
1, 2, 3, 4)
(Crystal)
×
2
7
1
1
1
CKIO
OFF
ON (
×
1, 2, 3, 4)
(CKIO)
Mode 0: An external clock is input from the EXTAL pin and executes waveform shaping by PLL
circuit 2 before being supplied inside this LSI.
Mode 1: An external clock is input from the EXTAL pin and its frequency is multiplied by 4 by
PLL circuit 2 before being supplied inside this LSI, allowing a low-frequency external clock to be
used.
Mode 2: The on-chip crystal oscillator operates, with the oscillation frequency being multiplied by
4 by PLL circuit 2 before being supplied inside this LSI, allowing a low-frequency external clock
to be used.
Mode 4: The on-chip crystal oscillator operates and executes waveform shaping by PLL circuit 2
before being supplied inside this LSI.
Mode 5: An external clock is input from the EXTAL pin and its frequency is multiplied by 2 by
PLL circuit 2 before being supplied inside this LSI, allowing a low-frequency external clock to be
used.
Mode 6: The on-chip crystal oscillator operates, with the oscillation frequency being multiplied by
2 by PLL circuit 2 before being supplied inside this LSI, allowing a low crystal frequency to be
used.
Содержание SH7705
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