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Rev. 5.00, 09/03, page 208 of 760
Mode 7: In this mode, the CKIO pin is an input, an external clock is input to this pin, and
undergoes waveform shaping, and also frequency multiplication according to the setting, by PLL
circuit 1 before being supplied to the chip. In modes 0 to 2, the system clock is generated from the
output of the chip’s CKIO pin. Consequently, if a large number of ICs are operating on the clock
cycle, the CKIO pin load will be large. This mode, however, assumes a comparatively large-scale
system. If a large number of ICs are operating on the clock cycle, a clock generator with a number
of low-skew clock outputs can be provided, so that the ICs can operate synchronously by
distributing the clocks to each one.
As PLL circuit 1 compensates for fluctuations in the CKIO pin load, this mode is suitable for
connection of synchronous DRAM.
Table 9.4 Available Combinations of Clock Mode and FRQCR Values
Clock
Mode FRQCR PLL1 PLL2
Clock Rate
*
(I:B:P)
Input Frequency
Range
CKIO Frequency
Range
0 H'0100 ON (× 1) ON (× 1) 1:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'0101 ON (× 1) ON (× 1) 1:1:1/2 25 MHz to 66.67 MHz 25 MHz to 66.67 MHz
H'0102 ON (× 1) ON (× 1) 1:1:1/4 25 MHz to 66.67 MHz 25 MHz to 66.67 MHz
H'0111 ON (× 2) ON (× 1) 2:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'0112 ON (× 2) ON (× 1) 2:1:1/2 25 MHz to 66.67 MHz 25 MHz to 66.67 MHz
H'0115 ON (× 2) ON (× 1) 1:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'0116 ON (× 2) ON (× 1) 1:1:1/2 25 MHz to 66.67 MHz 25 MHz to 66.67 MHz
H'0122 ON (× 4) ON (× 1) 4:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'0126 ON (× 4) ON (× 1) 2:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'012A ON (× 4) ON (× 1) 1:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'A100 ON (× 3) ON (× 1) 3:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'A101 ON (× 3) ON (× 1) 3:1:1/2 25 MHz to 66.67 MHz 25 MHz to 66.67 MHz
H'E100 ON (× 3) ON (× 1) 1:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz
H'E101 ON (× 3) ON (× 1) 1:1:1/2 25 MHz to 66.67 MHz 25 MHz to 66.67 MHz
H'A111 ON (× 6) ON (× 1) 6:1:1 25 MHz to 33.34 MHz 25 MHz to 33.34 MHz