Motorola 009 User Manual download pdf (Page 17)

System Overview

System Operation

MOTOROLA

SHI Port Usage

2-5

Figure 2-2

DSP-MCU System Flow Diagram

Hardware

Reset

HRNE = 0?

Yes

Read HRX

512 Words

No

No

Yes

HREQ = 0?

No

Send Word

512 Words

Yes

No

Yes

Move to Program

Enable Program

Init Peripherals

and Core

JMP *

Init Peripherals

JMP *

User Presses Button

MCU Calls

HREQ = 0?

No

Yes

Send Button

Exit Interrupt RoutineExit Interrupt Routine

Sent?

Received?

Read HRX

Construct GPIO Word

Write GPIOR

Interrupt Routine

MCU Operation DSP Operation

DSP Boot ROM Program DSP Run-time Application

Number

Causes HRNE=1

Generates SHI Interrupt

DSP Calls Service Routine

AA1416

RAM

RAM

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

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