upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 247

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

(4)
Caution:
Symbol
CKC
R/W
Clock control register (CKC)
This is an 8-bit register that controls system clock (f
of MPCCTL register is set to 1). This register can be read or written in 8-bit or 1-bit units.
Be sure to clear bits 2 to 7 of the CKC register to 0. In other case the operation is not guaranteed.
Data can be written to this register only in combination of specific sequences (refer to 3.2.3
”Special registers” on page 70).
CKDIV1
0
0
1
1
When operating the CPU and the peripherals by PLL mode, changing the CKC
register is prohibited.
R
7
0
CKDIV0
R
6
0
0
1
0
1
Figure 6-13: Clock Control Register (CKC) Format
Setting prohibited
f
f
f
PLL_MCKSEL_CKDIV
PLL_MCKSEL_CKDIV
PLL_MCKSEL_CKDIV
R
5
0
User’s Manual U16702EE3V2UD00
Chapter 6 Clock Generator
R
4
0
System clock (f
= f
= f
= f
R
3
0
PLL
PLL
PLL
(PLL internal clock) / 2
(PLL internal clock)
(PLL internal clock) / 4
XX
R
2
0
) when it operates on PLL mode (SELPLL bit
XX
) select on PLL mode
CKDIV1 CKDIV0 FFFFF822H
R/W
1
R/W
0
Address
After reset
03H
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