Chapter 3
Clock Generator
III - 6 Operation
3.3 Operation
3.3.1 Internal Clock Supply
■ Internal Clock Supply
Table:3.3.1 shows the internal clock supply.
Table:3.3.1 Internal Clock Supply (Multiplying Power to Oscillation Frequency)
..
Be sure to set the frequency of IOCLK to IOCLK ≤ 1/2MCLK.
..
■ At Reset Release
Supply to MCLK and IOCLK starts after a certain oscillation stabilization wait. When the oscillation frequency is
10 MHz, the oscillation stabilization wait time is 26.21 ms. Refer to [11.3.1 Oscillation Stabilization Wait Opera-
tion] for the oscillation stabilization wait.
Table:3.3.2 Frequency at Reset Release
..
Be sure to set the frequency of IOCLK to IOCLK ≤ 1/2MCLK.
..
Operation clock Setting condition MCK [1 : 0], IOCK [1 : 0] Destination
PLL non-selective PLL 4 multiplication PLL 6 multiplication PLL 8 multiplication
System clock
(MCLK)
00 : -
01 : -
10 : -
11 : 1/2 times
00 : -
01 : 1 times
10 : 2 times
11 : 4 times
00 : -
01 : 1.5 times
10 : 3 times
11 : 6 times
00 : -
01 : 2 times
10 : 4 times
11 : 8 times
CPU core
Internal RAM
Internal ROM
Bus controller
System clock
(IOCLK)
00 : -
01 : -
10 : -
11 : 1/4 times
00 : -
01 : 1/2 times
10 : 1 times
11 : 2 times
00 : -
01 : 0.75 times
10 : 1.5 times
11 : 3 times
00 : -
01 : 1 times
10 : 2 times
11 : 4 times
Internal peripheral function
* “_” is “setting prohibited”
* is status at reset release
Operation clock Clock frequency
System clock
(MCLK)
1/2 of oscillation frequency
System clock
(IOCLK)
1/4 of oscillation frequency
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