UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 106

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

5.6 Changing Setting of CPU Clock
5.6.1 Time required for switching CPU clock
clock is used for the duration of several instructions after that (refer to Table 5-3).
104
The CPU clock can be selected by using bits 0 to 2 (PCC0 to PCC2) of the processor clock control register (PCC).
Actually, the specified clock is not selected immediately after the setting of PCC has been changed, and the old
Remark One instruction is the minimum instruction execution time of the CPU clock before switching.
Set Value Before
Switching
PCC2
0
0
0
0
1
PCC1
0
0
1
1
0
PCC0
0
1
0
1
0
Table 5-3. Maximum Time Required for Switching CPU Clock
PCC2
2 instructions
8 instructions
0
4 instructions
1 instruction
PCC1
0
PCC0
0
CHAPTER 5 CLOCK GENERATOR
PCC2
16 instructions
0
2 instructions
User’s Manual U13029EJ7V1UD
4 instructions
1 instruction
PCC1
0
PCC0
Set Value After Switching
1
PCC2
16 instructions
2 instructions
0
8 instructions
1 instruction
PCC1
1
PCC0
0
PCC2
16 instructions
0
8 instructions
4 instructions
1 instruction
PCC1
1
PCC0
1
PCC2
16 instructions
1
8 instructions
4 instructions
2 instructions
PCC1
0
PCC0
0