CS5503-AS datasheet(39/54 Pages) CIRRUS

39 / 54 page

Notes:

1. CS5501 in Asynchronous (UART-like) mode.

2. TMS70X2 in Isosynchronous mode.

3. TMS70X2 with 8 MHz master clock has max

baud =1.0 Mbps.

Assumptions:

1. A0 used as CS.

2. Receive data via polling.

3. Word received put in A and B upon return, A = MS byte.

4. No error checking done.

5. Normal equates for peripheral registers.

Initial Code:

SPINIT: DINT

;

MOVP %1,ADDR

; A port is output

MOVP %1,APORT

; A0 = 1, (CS is inactive)

MOVP %0,P17

;

MOVP %>10,SCTLO ; Resets port errors

MOVP %?x1x01101,SMODE ; Set port for Isosync,

MOVP %?00x1110x,SCTLO ;

8 bits, no parity

MOVP %07,T3DATA ; Max baud rate

MOVP %?01000000,SCTL1 ; No multiprocessor;

;

prescale = 4

MOVP %0,IOCNT1

; Disable INT4 - will poll port

PUSH A

; Store original

MOVP RXBUF,A

; Bogus read to clr receiver port flag

POP

; Restore original

EINT

;

RET

;

Code to get word of data:

SP_IN:

MOVP %0,APORT

; CS active, select CS5501

WAIT1

BTJZP %2,SSTAT,WAIT1

; Wait to receive first byte

MOVP RXBUF,A

; Put most significant byte in reg. A

WAIT2

BTJZP %2,SSTAT,WAIT2

; Wait to receive second byte

MOVP RXBUF,B

; Put least significant byte in reg. B

MOVP %1,APORT

; CS inactive, deselect CS5501

RET

;

Figure A8. TMS70X2/CS5501 Serial Interface

CS5501

RXD

MODE

TMS70X2

(TMS70CX2)

-5V

SCLK

SDATA

SCLK

CS5501/CS5503

DS31F2

CS5503-AS 数据表(PDF) 39 Page - Cirrus Logic

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