EKTF6708 datasheet(132/158 Pages) EMC

132 / 158 page

eKTF6708

8-Bit Microcontroller

122



IC Product Specification (V1.2) 03.12.2020

(This specification is subject to change without prior notice)

6.13 HLVD (High / Low Voltage Detector)

R_BANK

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit0

Bank 1

0x49

HLVDCR

HLVDEN IRVSF

VDSB

VDM

HLVDS1

HLVDS0

R/W

Bank 0

0x14

SFR

LVDSF

R/W

Bank 0

0x1B

IMR

LVDIE

R/W

Bank 0

0x10

WUCR

LVDWK

R/W

Under unstable power source condition, such as external power noise interference or EMS

test condition, a violent power vibration could occur. At the time, the VDD could become

unstable as it could be operating below working voltage. When the system supply voltage

(VDD) is below operating voltage, the IC kernel will automatically keep all register status.

The following steps are needed to set up the HLVD function:

1. Set the H

LVDEN to “1”, then use Bits 1~0 (HLVDS1~HLVDS0) of Register Bank R to set

the HLVD interrupt level

2. Wait for HLVD interrupt to occur

3. Clear the HLVD interrupt flag

The internal HLVD module uses the internal circuit to fit. When user set the HLVDEN to

enable the HLVD module, the current consumption will increase to

A.

During sleep mode, the HLVD module continues to operate. If the device voltage drops

slowly and crosses the detect point. The LVDSF bit will be set and the device will not wake

up from Sleep mode. Until another wake-up source wakes up eKTF6708, the HLVD

interrupt flag is still set as the prior status.

When the system resets, the HLVD flag will be cleared.

The Figure 6-30 shows the HLVD module to detect the external voltage situation.

When VDD drops above VLVD, LVDSF remain

at “0”.

When VDD drops below VDB, LVDS

F set to “1”. If global ENI enable, LVDSF will be set to

“1”, the next instruction will branch to the interrupt vector. The HLVD interrupt flag is

cleared

to “0” by software.

EKTF6708 Datasheet(PDF) 132 Page - ELAN Microelectronics Corp

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