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EM78811

8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT

ELAN Microelectronics 

EM78811

8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT

RESET and Wake-up

The RESET can be caused by

(1) Power on reset, or Voltage detector

(2) WDT timeout. (if enabled and in GREEN or NORMAL mode)

Note that only Power on reset, or only Voltage detector in Case(1) is enabled in the system by CODE Option bit.

If Voltage detector is disabled, Power on reset is selected in Case (1). Refer to Fig. 14

VDD

DQ

Oscillator

CLK

CLK

CLR

.

Power-on

Reset

1M

0

U

X

Voltage

Detector

Code

Option

/Enable

WDTE

WDT

18 ms

RESET

Fig. 14 Block diagram of Reset of controller

Once the RESET occurs, the following functions are performed.

• The oscillator is running, or will be started.

• The Program Counter (R2) is set to all “0”.

• When power on, the upper 3 bits of R3 and the upper 2 bits of R4 are cleared.

• The Watchdog timer and prescaler are cleared.

• The Watchdog timer is disabled.

• The CONT register is set to all “1”

• The other register (bit7. . bit0)

R5 = "00000000"

R6 = PORT

R7 = PORT

R8 = PORT

R9 = PORT

RA = "000x0xxx

RB = "11111111"

RC = "00000000"

RD = "xxxxxxxx"

RE = "00000000"

RF = "00000000"

IOC6 = "11111111"

IOC7 = "11111111"

IOC8 = "11111111"

IOC9 = "11111111"

IOCA = "00000000"

IOCB = "00000000"

IOCC = "0xxxxxxx"

IOCD = "00000000"

IOCE = "00000000"

IOCF = "00000000"

Page1 IOCB = "00000000"

Page1 IOCC = "00000000"

Page1 IOCE = "00000000"

* This specification are subject to be changed without notice.

10.12.1998 16

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