CS5501 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5501

Non-aliasing, 16- & 20-bit A/D Converters

Cirrus Logic 

CS5501 CS5503

CS5501/CS5503

CS5501

TMS70X2

CS

A0

MODE SCLK

SDATA

-5V

SCLK

RXD

(TMS70CX2)

Figure A8. TMS70X2/CS5501 Serial Interface

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 A

; Restore original

EINT

;

RET

;

Code to get word of data:

SP_IN:

WAIT1

WAIT2

MOVP %0,APORT ; CS active, select CS5501

BTJZP %2,SSTAT,WAIT1 ; Wait to receive first byte

MOVP RXBUF,A ; Put most significant byte in reg. A

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

;

DS31F54

39

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