EM78P142 datasheet(79/96 Pages) EMC

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EM78P142

8-Bit Microprocessor with OTP ROM

Product Specification (V1.0) 01.25.2008

• 73

(This specification is subject to change without further notice)

Bit 3 (LVDIE):

Low voltage Detector interrupt enable bit.

= Disable Low voltage Detector interrupt

= Enable Low voltage Detector interrupt

When the detect-low-level-voltage state is used to enter an interrupt

vector or enter next instruction, the LVDIE bit must be set to “Enable“.

Bit 2 (LVDEN):

Low Voltage Detector Enable bit

= Low voltage detector disable

= Low voltage detector enable

Bits 1~0 (LVD1:0):

Low Voltage Detector level bits.

LVDEN

LVD1, LVD0

LVD voltage Interrupt Level

/LVD

Vdd ≤ 2.2V

Vdd > 2.2V

Vdd ≤ 3.3V

Vdd > 3.3V

Vdd ≤ 4.0V

Vdd > 4.0V

Vdd ≤ 4.5V

Vdd > 4.5V

××

6.13.2.2 RE (Interrupt Status 2 & Wake-up Control Register)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

/LVD

LVDIF

ADIF

“0”

ADWE

“0”

ICWE

LVDWE

NOTE

■ RE < 6, 5 > can be cleared by instruction but cannot be set.

■ IOCE0 is the interrupt mask register.

■ Reading RE will result to "logic AND" of RE and IOCE0.

Bit 7 (/LVD):

Low voltage Detector state. This is a read only bit. When the VDD pin

voltage is lower than LVD voltage interrupt level (selected by LVD1 and

LVD0), this bit will be cleared.

= Low voltage is detected.

= Low voltage is not detected or LVD function is disabled.

Bit 6 (LVDIF):

Low Voltage Detector interrupt flag

LVDIF reset to “0” by software or hardware.

Bit 0 (LVDWE):

Low Voltage Detect wake-up enable bit.

= Disable Low Voltage Detect wake-up.

= Enable Low Voltage Detect wake-up.

When the Low Voltage Detect is used to enter an interrupt vector or to

wake up the IC from sleep/idle with Low Voltage Detect running, the

LVDWE bit must be set to “Enable“.

EM78P142 Datasheet(PDF) 79 Page - ELAN Microelectronics Corp

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