m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 506

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

R
R
M
27.16 Low Voltage Operations
e
E
3
. v
J
Figure 27.3 VDC Disconnection Procedure
2
0
The voltage down converter (VDC) is a circuit used to step down external supply voltage to the internal
operation voltage of 3.3V. Disconnect the VDC when applying a 3.3V supply voltage to reduce power
consumption.
Figure 27.3 shows the procedure for disconnecting the VDC.
Perform these settings immediately after reset, while the CPU clock is divided by 8. Do not set the VDC0
register (001B
voltage of 3.3V or more.
C
1
9
3 .
B
8 /
0
1
3
0
3
J
G
4
a
o r
0 -
n
3 .
1
u
, 1
3
p
1
(
2
M
0
16
0
3
6
) to other values. Furthermore, do not write to the VDC0 register when applying a supply
2
C
Page 483
8 /
, 3
M
Set PRC3 bit in PRCR register to "0" (write disable)
Set PRC3 bit in PRCR register to "1" (write enable)
3
2
C
f o
8 /
4
3
8
) T
8
Set VDC0 register to "8F
Set VDC0 register to "0F
16
16
"
"
27. Precautions (Low Voltage Operations)