m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 100

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

R
R
M
e
E
3
. v
J
2
Figure 8.11 Switching Procedure from On-chip Oscillator Clock to Main Clock
0
1
9
C
8.1.4 PLL Clock
3 .
B
8 /
The PLL frequency synthesizer generates the PLL clock based on the main clock. The PLL clock can be
used as a clock source for the CPU clock or peripheral function clock.
Connect a resistor and capacitor to the V
Set the PD8_6 and PD8_7 bits in the PD8 register to "0" (input mode) and the CM04 bit to "0" (the X
and X
is shown in Figure 8.12. Set the PLV00 bit in the PLV register to "1" (power to PLL).
The PLL frequency synthesizer stops after reset. When the PLC07 bit is set to "1" (PLL on), the PLL
frequency synthesizer starts operating. Wait 20 ms (5 V operation) to 50 ms (3.3 V operation) for the PLL
clock to stabilize.
The PLL clock can either be the clock output from the voltage controlled oscillator (VCO) divided-by-2 or
divided-by-3.
When the PLL clock is used as a clock source for the CPU clock or peripheral function clock, set each bit
as is shown in Table 8.2. Figure 8.13 shows the procedure for using the PLL clock as the CPU clock
source.
To enter wait or stop mode, set the CM17 bit to "0" (main clock as CPU clock source). Set the PLC07 bit
in the PLC0 register to "0" (PLL off) and the PLV00 bit to "0" (no power to PLL) before the microcomputer
enters wait or stop mode.
The V
being used, the sub clock cannot be used.
0
1
3
0
3
J
G
4
a
0 -
n
o r
COUT
CONT
3 .
1
u
, 1
3
p
1
2
(
M
pins as ports). After that, connect the V
0
and P8
0
3
6
2
C
8 /
Page 77
6
, 3
pins share pins with X
M
3
2
C
f o
8 /
No
4
3
8
) T
8
(main clock as CPU clock source)
Determine several times whether
Set the MCD register to "08
(main clock does not stop)
the CM23 bit is set to "0"
Set the CM22 bit to "0"
Set the CM21 bit to "0"
(main clock oscillates)
Switch to the
(divide-by-8)
CONT
main clock
CIN
End
and X
Yes
pin when using the PLL frequency synthesizer.
CONT
COUT
16
"
pin, the P8
pins. When the PLL frequency synthesizer is
CM21 to CM23 bits : Bits in CM2 register
6
pin, and the V
8. Clock Generation Circuit
SS
pin to the circuit as
CIN