SM39R4051 datasheet(11/47 Pages) SYNCMOS

Teilenummer	SM39R4051

Bauteilbeschribung	One serial peripheral interfaces in full duplex mode

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Hersteller	SYNCMOS [SyncMOS Technologies,Inc]

Direct Link	http://www.syncmos.com.tw

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SM39R4051/SM39R2051

8-Bit Micro-controller

4KB/2KB with ISP Flash

& 256B RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M055

11

Ver.E SM39R4051 09/2011

1.4.4.

Software Reset register (SWRES)

Mnemonic: SWRES

Address: E7H

7

6

5

4

3

2

1

0

Reset

SWRES [7:0]

00H

SWRES [7:0]: Software reset register bit. These 8-bit is self-reset at the end of the reset procedure.

SWRES [7:0] = FFh, software reset.

SWRES [7:0] = 00h ~ FEh, MCU no action.

1.4.5.

Example of software reset

MOV TAKEY, #55h

MOV TAKEY, #0AAh

MOV TAKEY, #5Ah ; enable SWRES write attribute

MOV SWRES, #0FFh; software reset MCU

1.5.

Clocks

The default clock is the external crystal. This clock is used during the initialization stage. The major work of the

initialization stage is to determine the clock source used in normal operation.

The internal clock sources are from the on-chip RC-Oscillator with programmable frequency outputs as table 1-1，the

clock source can set by writer or ICP。

Table 1-1: Selection of clock source

Clock source

external crystal (use XTAL1 and XTAL2 pins ) (default)

external crystal (only use XTAL1, the XTAL2 define as I/O)

20MHz from on-chip RC-Oscillator

16MHz from on-chip RC-Oscillator

12MHz from on-chip RC-Oscillator

8MHz from on-chip RC-Oscillator

4MHz from on-chip RC-Oscillator

2MHz from on-chip RC-Oscillator

1MHz from on-chip RC-Oscillator

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