TMS320C40 datasheet(13/45 Pages) TI

13 / 45 page

TMS320C40

DIGITAL SIGNAL PROCESSOR

SPRS038 – JANUARY 1996

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

communication-port software reset (’C40 silicon revision

≥ 5.0)

The input and output FIFO levels for a communication port can be flushed by writing at least two back-to-back

values to its communication-port-software reset address as specified in Table 1. This feature is not present in

’C40 silicon revision <5.0. This software reset flushes any word or byte already present in the FIFOs but it does

not

affect

the

status

the

communication-port

pins.

Figure

shows

example

communication-port-software reset.

Table 1. Communication-Port Software-Reset Address

COMMUNICATION PORT

SOFTWARE RESET ADDRESS

0x0100043

0x0100053

0x0100063

0x0100073

0x0100083

0x0100093

; –––––––––––––––––––––––––––––––––––––––––––––-–––;

; RESET1:Flush’s FIFO data for communication port 1;

; –––––––––––––––––––––––––––––––––––––––––––––-–––;

RESET1 push

AR0

; Save registers

push

;

push

;

ldhi

010h,AR0

; Set AR0 to base address of COM 1

050h,AR0

;

flush: rpts

; Flush FIFO data with back-to-back write

sti

R0,*+AR0(3)

;

rpts

; Wait

nop

;

ldi

*+AR0(0),R0

; Check for new data from other port

and

01FE0h,R0

;

bnz

flush

;

pop

; Restore registers

pop

;

pop

AR0

;

rets

; Return

Figure 2. Example of Communication-Port-Software Reset

TMS320C40 Datasheet(PDF) 13 Page - Texas Instruments

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