EM78P153E 查看數據表（PDF） - ELAN Microelectronics

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EM78P153E

8-bit microprocessor designed and developed with low-power and high-speed CMOS technology

ELAN Microelectronics 

EM78P153E

OTP ROM

The sleep (power down) mode is attained by executing the “SLEP” instruction. While entering sleep

mode, WDT (if enabled) is cleared but keeps on running. The controller can be awakened by

(1) External reset input on /RESET pin,

(2) WDT time-out (if enabled), or

(3) Port 6 input status changes (if enabled).

The first two cases will cause the EM78P153E to reset. The T and P flags of R3 can be used to

determine the source of the reset (wake-up). The last case is considered the continuation of program

execution and the global interrupt ("ENI" or "DISI" being executed) decides whether or not the

controller branches to the interrupt vector following wake-up. If ENI is executed before SLEP, the

instruction will begin to execute from the address 008H after wake-up. If DISI is executed before

SLEP, the operation will restart from the instruction right next to SLEP after wake-up.

Only one of Cases 2 and 3 can be enabled before entering the sleep mode. That is,

[a] if Port 6 input status changed interrupt is enabled before SLEP , WDT must be disabled. by

software. However, the WDT bit in the option register remains enabled. Hence, the EM78P153E can

be awakened only by Case 1 or 3.

[b] if WDT is enabled before SLEP, Port 6 Input Status Change Interrupt must be disabled. Hence, the

EM78P153E 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 EM78P153E (Case [a] above), the

following instructions must be executed before SLEP:

MOV A, @xxxx1110b

CONTW

WDTC

MOV A, @0xxxxxxxb

IOW RE

MOV R6, R6

MOV A, @00000x1xb

IOW RF

ENI (or DISI)

SLEP

; Select WDT prescaler

; Clear WDT and prescaler

; Disable WDT

; Read Port 6

; Enable Port 6 input change interrupt

; Enable (or disable) global interrupt

; Sleep

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

automatically. The WDT operation (being enabled or disabled) should be handled appropriately by

software after waking up from sleep mode.

This specification is subject to change without prior notice.

18

2002/03/01

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