CHAPTER 8 CLOCK GENERATOR FUNCTIONS
User’s Manual U12688EJ4V0UM00
233
8.3.3 Clock control register (CKC)
When in the PLL mode, this is an 8-bit register which controls the internal system clock frequency (
φ
), and it can
be written to only by a specific combination of instruction sequences so that it cannot be rewritten easily by mistake
due to program runaway.
This register can be read/written in 8- or 1-bit units.
Caution When in the direct mode, do not change the setting of this register.
Address
FFFFF072H
7
0
CKC
6
0
5
0
4
0
3
0
2
0
1
CKDIV1
0
CKDIV0
After reset
00H
Bit Position
Bit Name
Function
Clock Divide
Sets the internal system clock frequency (
φ
) when in the PLL mode.
CKDIV1
CKDIV0
Internal System Clock (
φ
)
0
0
5
×
f
XX
0
1
Setting prohibited
1
0
f
XX
1
1
f
XX
/2
1, 0
CKDIV1,
CKDIV0
The sequence of setting data to this register is the same as for the power save control register (PSC). However,
the restrictions shown in Remark 2 of 3.4.9 Specific registers do not apply. For details, refer to 8.5.2 Control
registers.
Example Clock generator setting
CKC Register
Operation
Mode
CKSEL Pin
CKDIV1 Bit
CKDIV0 Bit
Input Clock
(f
XX
)
Internal System
Clock (
φ
)
Direct mode
High-level input
0
0
16 MHz
8 MHz
0
0
8 MHz
40 MHz
1
0
8 MHz
8 MHz
PLL mode
Low-level input
1
1
8 MHz
4 MHz
Other than above
Setting prohibited
Содержание V850E/MS1 UPD703100
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