EM78156EAS datasheet(21/48 Pages) EMC

21 / 48 page

EM78156E

8-Bit Microcontroller with MASK ROM

Product Specification (V1.3) 07.29.2004

• 17

(This specification is subject to change without further notice)

[b]

if WDT is enabled before SLEP, Port 6 Input Status Change Interrupt must be

disabled. Hence, the EM78156E can be awakened only by Case 1 or 2. Refer to

the section on Interrupt.

If Port 6 Input Status Change Interrupt is used to wake-up the EM78156E (Case [a]

above), the following instructions must be executed before SLEP:

MOV A, @xx000110b

; Select internal TCC clock

CONTW

CLR R1

; Clear TCC and prescaler

MOV A, @xxxx1110b

; Select WDT prescaler

CONTW

WDTC

; Clear WDT and prescaler

MOV A, @0xxxxxxxb

; Disable WDT

IOW RE

MOV R6, R6

; Read Port 6

MOV A, @00000x1xb

; Enable Port 6 input change interrupt

IOW RF

ENI (or DISI)

; Enable (or disable) global interrupt

SLEP

; Sleep

NOP

One problem user should be aware of, is that after waking up from the sleep mode,

WDT would enable automatically. The WDT operation (being enabled or disabled)

should be handled appropriately by software after waking up from the sleep mode.

Table 5 The Summary of the Initialized Values for Registers

Address

Name

Reset Type

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit Name

C53

C52

C51

C50

Power-On

/RESET and WDT

N/A

IOC5

Wake-Up from Pin

Change

Bit Name

C67

C66

C65

C64

C63

C62

C61

C60

Power-On

/RESET and WDT

N/A

IOC6

Wake-Up from Pin

Change

Bit Name

/INT

PAB

PSR2 PSR1 PSR0

Power-On

N/A

CONT

/RESET and WDT

EM78156EAS Datasheet(PDF) 21 Page - ELAN Microelectronics Corp

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