SM39R4051 datasheet(10/47 Pages) SYNCMOS

Nome de Peças	SM39R4051

Descrição Electrónicos	One serial peripheral interfaces in full duplex mode

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Fabricante Electrônico	SYNCMOS [SyncMOS Technologies,Inc]

Página de início	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

10

Ver.E SM39R4051 09/2011

011

4T mode

100

5T mode

101

6T mode

110

7T mode

111

8T mode

The default is in 2T mode, and it can be changed to another Instruction timing mode if CKCON [6:4] (at address 8Eh) is

change any time. Not every instruction can be executed with one machine cycle. The exact machine cycle number for all

the instructions are given in the next section.

1.4.

RESET

1.4.1.

Hardware RESET function

SM39R4051 provides on-chip hardware RESET mechanism,，the reset duration is programmable by writer or ISP。

on-chip hardware RESET duration

25ms (default)

200ms

100ms

50ms

16ms

8ms

4ms

1.4.2.

Software RESET function

SM39R4051 provides one software reset mechanism to reset whole chip. To perform a software reset, the firmware must

write three specific values 55h, AAh and 5Ah sequentially to the TAKEY register to enable the Software Reset register

(SWRES) write attribute. After SWRES register obtain the write authority, the firmware can write FFh to the SWRES

register. The hardware will decode a reset signal that “OR” with the other hardware reset. The SWRES register is

self-reset at the end of the software reset procedure.

Mnemonic

Description

Direct

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RESET

Software Reset function

TAKEY

Time Access Key

register

F7h

TAKEY [7:0]

00H

SWRES

Software Reset

register

E7h

SWRES [7:0]

00H

1.4.3.

Time Access Key register (TAKEY)

Mnemonic: TAKEY

Address: F7H

7

6

5

4

3

2

1

0

Reset

TAKEY [7:0]

00H

Software reset register (SWRES) is read-only by default; software must write three specific values

55h, AAh and 5Ah sequentially to the TAKEY register to enable the SWRES register write attribute. That

is:

MOV TAKEY, #55h

MOV TAKEY, #0AAh

MOV TAKEY, #5Ah

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