Register Descriptions; Low-Voltage-Detection Control Register (Lvdcr); Figure 17.2 Block Diagram Of Power-On Reset Circuit And Low-Voltage Detection Circuit - Renesas H8/36912 Series User Manual

External
power
supply
[Legend]
PSS:
LVDCR:
LVDSR:
VBGR:
ExtD:
ExtU:
VDDII:

Figure 17.2 Block Diagram of Power-On Reset Circuit and Low-Voltage Detection Circuit

17.2

Register Descriptions

The low-voltage detection circuit has the following registers.

• Low-voltage-detection control register (LVDCR)

• Low-voltage-detection status register (LVDSR)
17.2.1 Low-Voltage-Detection Control Register (LVDCR)
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.
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Vreset
Ladder
VintU
Vcc
network
VintD
ExtD
ExtU
VDDII
VBGR
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
φ
Noise filter
circuit
Noise filter
circuit
Interrupt
control
circuit
OVF
CK
PSS
R
R
Q
S
Power-on reset circuit
LVDCR
LVDSR
Interrupt request
Rev. 1.00, 11/03, page 269 of 376
Internal
reset signal