HD64336901G Renesas Technology, HD64336901G Datasheet - Page 297

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

17.2
The low-voltage detection circuit has the following registers.
17.2.1
LVDCR enables or disables the low-voltage detection circuit and BGR circuit, selects the
compared voltage of the LVDI circuit, sets the detection levels for the LVDR circuit, enables or
disables the LVDR circuit, and enables or disables generation of an interrupt when the power-
supply voltage rises above or falls below the respective levels.
Table 17.1 shows the relationship between the LVDCR settings and functions to be selected.
LVDCR should be set according to table 17.1.
Figure 17.2 Block Diagram of Power-On Reset Circuit and Low-Voltage Detection Circuit
External
Low-voltage-detection control register (LVDCR)
Low-voltage-detection status register (LVDSR)
supply
power
[Legend]
PSS:
LVDCR:
LVDSR:
VBGR:
ExtD:
ExtU:
VDDII:
Register Descriptions
Low-Voltage-Detection Control Register (LVDCR)
VBGR
ExtD
ExtU
Vcc
Prescaler S
Low-voltage-detection control register
Low-voltage-detection status register
Reference voltage from BGR
Compared voltage for falling external input voltage
Compared voltage for rising external input voltage
Bit 5 in LVDCR
network
Ladder
VDDII
Vreset
VintU
VintD
Noise filter
Noise filter
circuit
circuit
Interrupt
control
circuit
CK
Rev. 1.00, 11/03, page 269 of 376
R
Power-on reset circuit
PSS
LVDCR
LVDSR
OVF
R
S
Q
Interrupt request
Internal
reset signal