CS5501-SD datasheet(38/54 Pages) CIRRUS

38 / 54 page

Notes:

1. CS5501 in Synchronous External Clocking mode.

2. Interrupt driven I/O on 8051 (For polling, connect

DRDY to another port pin).

Assumptions:

1. INT1 external interrupt used.

2. Register bank 1, R6, R7 used to store data word,

R7 MSbyte.

3. EA enabled elsewhere.

Initial Code:

EQU

P1.1

SCLK

EQU

P1.2

DATA

EQU

P1.3

SPINIT: CLR

EX1

; Disable INT1

SETB IT1

; Set INT1 for falling edge triggered

SETB DATA

; Set DATA to be input pin

SETB CS

; CS = 1; deselect CS5501

CLR

SCLK

; SCLK low

SETB EX1

; Enable INT1 interrupt

Code to get word of data:

ORG 0003H

LJMP

GETWD

; Interrupt vector

GETWD: PUSH PSW

; Save temp. copy

PUSH A

; Save temp. copy

MOV

PSW,#08

; Set register bank 1 active

MOV

R6,#8

; number of bits in a byte

CLR

; CS = 0; select CS5501

MSBYTE:SETB SCLK

; Toggle SCLK high

MOV

C,DATA

; Put bit of data into carry bit

CLR

SCLK

; Toggle SCLK low; next data bit

RLC

; Shift DATA bit into A register

DJNZ

R6,MSBYTE ; Dec. R6, if not 0, get another bit

MOV

R7,A

; Put MSbyte into R7

MOV

R6,#8

; Reset R6 to number of bits in byte

LSBYTE: SETB SCLK

; Toggle SCLK high

MOV

C,DATA

; Put bit of data into carry bit

CLR

SCLK

; Toggle SCLK low; next data bit

RLC

; Shift DATA bit into A register

DJNZ

R6,LSBYTE

; Dec. R6, if not 0, get another bit

MOV

R6,A

; Put LSbyte into R6

SETB CS

; CS = 1; deselect CS5501

POP

; Restore original value

POP

PSW

; Restore original value

RETI

Figure A6. MCS51 (8051) /CS5501 Serial Interface

CS5501

MODE

8051

P1.1

P1.3

P1.2

INT1

SDATA

SCLK

DRDY

Notes:

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

2. 8051 in mode 2, with OSC = 12 MHz,

max baud = 375 kbps.

Assumptions:

1. P1.2 (port 1, bit 2) used as CS.

2. Using serial port mode 2, Baud rate = OSC/32.

(Assumptions cont.)

3. Word received put in A (ACC) and B registers,

A = MSbyte.

4. No error checking done.

5. Equates used for peripheral names.

Initial Code:

SPINIT: SETB SMOD

; Set SMOD = 1, baud = OSC/32

SETB P1.2

; CS = 1, inactive

MOV

SCON,#1001000B

; Enable serial port mode 2,

; receiver enabled, transmitter disabled

CLR

; Disable serial port interrupts (polling)

RET

;

Code to get word of data:

SP_IN:

CLR

P1.2

; CS = 0, active; select CS5501

JNB

RI,$

; Wait for first byte

CLR

;

MOV

A,SBUF

; Put most significant byte in A

JNB

RI,$

; wait for second byte

CLR

;

MOV

B,SBUF

; Put least significant byte in B

SETB P1.2

; CS = 1, inactive; deselect CS5501

RET

;

Figure A7. MCS51 (8051) /CS5501 UART Interface

CS5501

RXD

MODE

8051

-5V

OSC

P1.2

SDATA

SCLK

CS5501/CS5503

DS31F2

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