EM78452WM datasheet(34/54 Pages) EMC

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EM78452

8-Bit Microcontroller

•

Product Specification (V1.0) 10.18.2007

(This specification is subject to change without further notice)

MOV 0X06,A

MOV A,@0X00

MOV 0X0B,A

NOP

JBC 0X0D,4

JMP $-2

BS 0X0D,4

JMP INITI

BC 0x0C,1

NOP

JMP SPI

DELAY:

EOP

ORG 0XFFF

BS 0x0C,7

; Send a signal to master to prevent

; infinite loop

; (user’s program)

5.6 Timer 1

5.6.1 Overview

Timer 1 (TMR1) is an 8-bit clock counter with programmable prescaler. The TMR1 is in

SPI baud rate clock generator mode (SBRS0, SBRS1and SBRS2 a1l set to 1) and then

SPI control register Bit 4 (SSE) is set to “1”. Timer 1 will be enabled automatically

without setting TM1E. TMR1 can be read and written to, and cleared on any reset

conditions.

5.6.2 Function Description

Fig. 5-14 shows Timer 1 block diagram. Each signal and block is described as follows:

OSC / 4

TMR1

up Counter

Set TM1IF

TM1E

Overflow

Set predict value

TMR1 value

Prescaler

1:1~1:16

In SPI baud

generator mode ?

Yes

Interrupt

and

SPI clock output

T1ROS

Fig. 5-14 Timer 1 Block Diagram

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