CHAPTER 6 CLOCK GENERATION FUNCTION
User’s Manual U13850EJ6V0UD
185
(a) Example of main clock operation
→
→
→
→
subclock operation setup
<1> CK2
←
1:
Bit manipulation instructions are recommended. Do not change CK1 and CK0.
<2> Subclock operation:
The maximum number of the following instructions is required before subclock
operation after the CK2 bit is set.
(CPU clock frequency before setting / subclock frequency)
×
2
Therefore, insert the wait described above using a program.
<3> MCK
←
1:
Only when the main clock is stopped.
(b) Example of subclock operation
→
→
→
→
main clock operation setup
<1> MCK
←
0:
Main clock oscillation start
<2> Insert a wait using a program and wait until the main clock oscillation stabilization time elapses.
<3> CK2
←
0:
Bit manipulation instructions are recommended. Do not change CK1 and CK0.
<4> Main clock operation: At most two instructions are required before main clock operation after the CK2
bit is set.
Содержание V850/SB1
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