EM78R911 Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM78R911

8-bit micro-controller

ELAN Microelectronics 

EM78911

8-bit micro-controller

. VII 5 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. 12.

Fig. 12 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 = PORT

IOC5 = "11110000"

R6 = PORT

IOC6 = "11111111"

R7 = PORT

IOC7 = "11111111"

R8 = PORT

IOC8 = "11111111"

R9 = PORT

IOC9 = "11111111"

RA = "x00x0xxx IOCA = "00000000"

RB = "11111111" Page0 IOCB = "00000000" Page1 IOCB = "00000000"

RC = "00000000" Page0 IOCC = "0xxxxxxx" Page1 IOCC = "00000000"

RD = "xxxxxxxx" Page0 IOCD = "00000000" Page1 IOCD = “00000000”

RE = "00000000" Page0 IOCE = "00000000" Page1 IOCE = "00000000"

RF = "00000000" IOCF = "00000000"

The controller can be awakened from SLEEP mode or IDLE mode (execution of "SLEP" instruction, named

as SLEEP MODE or IDLE mode) by (1)TCC time out (2) WDT time-out (if enabled) or, (3) external input at

PORT9. The three cases will cause the controller wake up and run from next instruction. After wake-up , user

should control WATCH DOG in case of reset in GREEN mode or NORMAL mode. The last two should be open

17

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