EMC EM78612 Manuale Utente Scaricare il pdf (Pagina 9)

EM78612

Universal Serial Bus Microcontroller Series

This specification may change without further notice. 9 3/5/2003 (V1.0)

R3 (Status Register) Default Value:(0B_0001_1000)

7 6 5 4 3 2 1 0

- - PS0 T P Z DC C

R3 [0] Carry flag.

R3 [1] Auxiliary carry flag.

R3 [2] Zero flag. It will be set to 1 when the result of an arithmetic or logic operation is

zero.

R3 [3] Power down flag. It will be set to 1 during Power-on phase or by “WDTC” command

and cleared when the MCU enters into Power down mode. It remains in its previous

state after WatchDog Reset.

1: Power-on.

0: Power down

R3 [4] Time-out flag. It will be set to 1 during Power-on phase or by “WDTC” command. It

is reset to 0 by WDT time-out.

1: WatchDog timer without overflow.

0: WatchDog timer with overflow.

The various states of Power down flag and Time-out flag at different conditions are shown

below:

T P Condition

Power-on reset

WDTC instruction

WDT time-out

Power down mode

Wakeup caused by port change during Power down mode

*P: Previous status before WDT reset

R3 [5] Page selection bit. This bit is used to select a page of program memory (refer to R2,

Program Counter).

PS0 Program Memory Page [Address]

0 Page 0 [0000-03FF]

1 Page 1 [0400-07FF]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 28 29

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EMC EM78612 Manuale Utente Pagina 9