r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 160
r5f21346mnfp
Manufacturer Part Number
r5f21346mnfp
Description
Single-chip Mcus Incorporates The R8c Cpu Core
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5F21346MNFP.pdf
(776 pages)
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Part Number:
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Manufacturer:
Renesas Electronics America
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R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
9.7
9.7.1
Table 9.3
− : Indicates that either 0 or 1 can be set.
High-speed
clock mode
Low-speed
clock mode
High-speed
on-chip
oscillator
mode
Low-speed
on-chip
oscillator
mode
There are three power control modes. All modes other than wait mode and stop mode are referred to as standard
operating mode.
Standard operating mode is further separated into four modes.
In standard operating mode, the CPU and peripheral function clocks are supplied to operate the CPU and the
peripheral functions. Power consumption control is enabled by controlling the CPU clock frequency. The
higher the CPU clock frequency, the more processing power increases. The lower the CPU clock frequency, the
more power consumption decreases. If unnecessary oscillator circuits stop, power consumption is further
reduced.
Before the clock sources for the CPU clock can be switched over, the new clock source needs to be oscillating
and stable. Allow sufficient wait time in a program until oscillation stabilizes before switching the clock.
Power Control
Modes
Standard Operating Mode
No division
Divide-by-2
Divide-by-4
Divide-by-8
Divide-by-16
No division
Divide-by-2
Divide-by-4
Divide-by-8
Divide-by-16
No division
Divide-by-2
Divide-by-4
Divide-by-8
Divide-by-16
No division
Divide-by-2
Divide-by-4
Divide-by-8
Divide-by-16
Settings and Modes of Clock Associated Bits
Register
OCD2
OCD
0
0
0
0
0
−
−
−
−
−
1
1
1
1
1
1
1
1
1
1
CM17,
CM16
00b
01b
10b
00b
01b
10b
00b
01b
10b
00b
01b
10b
11b
11b
11b
11b
−
−
−
−
CM1 Register
CM14 CM13 CM07 CM06 CM05 CM04 CM03 FRA01 FRA00
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
0
0
0
0
0
1
1
1
1
1
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
CM0 Register
0
0
0
0
0
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
1
1
1
1
1
−
−
−
−
−
−
−
−
−
−
9. Clock Generation Circuit
−
−
−
−
−
0
0
0
0
0
−
−
−
−
−
−
−
−
−
−
FRA0 Register
Page 128 of 740
−
−
−
−
−
−
−
−
−
−
1
1
1
1
1
0
0
0
0
0
−
−
−
−
−
−
−
−
−
−
1
1
1
1
1
−
−
−
−
−
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