Zilog Z8PE002 Manual do Utilizador descarregar pdf (Página 23)

Z8PE002

ZiLOG Z8Plus OTP Microcontroller

DS008700-Z8X0799 P R E L I M I N A R Y 23

STOP MODE OPERATION

The STOP mode provides the lowest possible device stand-

by current. This instruction turns off the on-chip oscillator

and internal system clock.

To enter the

STOP mode, the Z8Plus only requires a STOP

instruction. It is not necessary to execute a NOP instruction

immediately before the

STOP instruction.

The

STOP mode is exited by any one of the following resets:

POR or a Stop-Mode Recovery source. At reset generation,

the processor always restarts the application program at ad-

dress

0020H, and the STOP mode flag is set. Reading the

STOP mode flag does not clear it. The user must clear the

STOP mode flag with software.

Note: Failure to clear the STOP mode flag can result in unde-

fined behavior.

The Z8Plus provides a dedicated Stop-Mode Recovery

(

SMR) circuit. In this case, a low-level applied to input pin

PB0 (I/O Port B, bit 0) triggers an SMR. To use this mode,

PB0 must be configured as an input and the special func-

tion selected before the

STOP mode is entered. The Low

level on

PB0 must be held for a minimum pulse width

WSM

. Program execution starts at address 20h, after the

POR delay.

Notes: 1. The PB0 input, when used for Stop-Mode Recovery,

does not initialize the control registers.

The STOP mode current (I

CC2

) is minimized when:

• V

is at the low end of the device’s operating range

• Output current sourcing is minimized

• All inputs (digital and analog) are at the Low or High

rail voltages

2. For detailed information about flag settings, see the

Z8Plus User’s Manual.

6F STOP ;enter STOP mode

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