upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 239

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

(4)
Caution:
Symbol
PCC
R/W
MFRC
CK2
Processor clock control register (PCC)
The processor clock control register (PCC) is a special register. This register can be read or
written in 8-bit or 1-bit units. Data can be written to this register only in combination of specific
sequences (refer to 3.2.3 ”Special registers” on page 70).
0
0
0
0
1
1
1
1
0
1
R
When operating the CPU and peripherals by PLL, changing the PCC register is
prohibited.
7
0
Used
Not Used
CK1
0
0
1
1
0
0
1
1
Figure 6-5: Processor Clock Control Register (PCC) Format
R
6
0
CK0
MFRC
0
1
0
1
0
1
0
1
R/W
5
User’s Manual U16702EE3V2UD00
f
f
f
f
f
f
Setting prohibited
CPU
CPU
CPU
CPU
CPU
CPU
Chapter 6 Clock Generator
Use of Main clock on –chip feedback register
R
4
0
= f
= f
= f
= f
= f
= f
XX
XX
XX
XX
XX
XX
/2
/4
/8
/16
/32
R
3
0
CK2
R/W
2
Clock selection (for f
CK1
R/W
1
R/W
CK0
0
CPU
)
FFFFF828H
Address
After reset
00H
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