CS5503-BP 查看數據表（PDF） - Cirrus Logic

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CS5503-BP

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

Cirrus Logic 

CS5501 CS5503

CS5501/CS5503

CS5501

CS5503

CS

MODE SCLK

SDATA

68HC11

PA6

+5V

SCK

SS

MISO

(68HC05)

Figure A3. 68HC11/CS5501 Serial Interface

Notes:

1. CS5501 in Synchronous External Clocking mode.

2. Using 68HC11’s SPI port. (Can use SCI and

CS5501’s Asynchronous mode.)

3. Maximum bit rate is 1.05 Mbps.

Assumptions:

1. PA6 used as CS.

2. 68HC11 in single-chip mode.

3. Receive data via polling.

4. Normal equates for peripheral registers.

5. Data returned in register D.

Initial Code:

SPINIT: PSHA

; Store temporary copy of A

LDAA #%x1xxxxxx ; Bit 6 = 1, all others are don’t cares

STAA PORTA

; CS = 1, inactive; deselect CS5501

LDAA #$10

;

STAA SPCR

; Disable serial port

LDAA #%xx0110xx ; SS-input, SCK-output,

; MOSI-output, MISO-input

STAA DDRD

; Data direction register for port D

LDAA #$50

; Enable serial port, CMOS outputs,

STAA SPCR

; master, highest clock rate (int. clk/2)

LDAA SPSR

;

LDAA SPDR

; Bogus read to clr port and SPIF flag

PULA

; Restore A

RTS

;

Code to get word of data:

SP_IN:

WAIT1:

WAIT2:

LDAA

STAA

STAA

LDAA

BPL

LDAA

STAA

LDAB

BPL

LDAB

STAB

LDAB

RTS

#%x0xxxxxx

PORTA

SPDR

SPSR

WAIT1

SPDR

SPDR

SPSR

WAIT2

#%x1xxxxxx

PORTA

SPDR

;

; CS = 0, active; select CS5501

; Put data in serial port to start clk

; Get port status

; If SPIF (MSB) 0, no data yet, wait

; Put most significant byte in A

; Start serial port for second byte

; Get port status

; If SPIF (MSB) 0, no data yet, wait

;

; CS = 1, inactive; deselect CS5501

; Put least significant byte in B

;

CS5501

CS5503 CS

MODE SCLK

SDATA

COPS 444

G0

SK

DI

(All COPS)

Figure A4. COPS/CS5501 Interface

Notes:

1. CS5501 in Synchronous External Clocking mode.

2. COPS 444 max baud = 62.5 kbps. (Others = 500 kbps)

3. See timing diagram for detailed timing.

Assumptions:

1. G0 used as CS.

2. Register 0 (upper four nibbles) used to store 16-bit word.

Initial Code:

SPINIT: OGI 15

RC

XAS

; CS = 1, inactive; deselect CS5501

; Reset carry, used in next

; instruction to turn SK off

Code to get word of data:

SP_IN: LBI 0,12

SC

OGI

LEI

XAS

NOP

NOP

GETNIB: NOP

XAS

XIS

JP

RC

14

0

GETNIB

XAS

OGI 15

RET

; Point to start of data

; storage location

; Set carry - enables SK in

; XAS instruction

; CS = 0, active; select CS5501

; Shift register mode, S0 = 0

; Start clocking serial port

;

; Wait for (first) M.S. nibble

;

; Get nibble of data from SIO

; Put nibble in memory, inc. pointer,

; if overflow, jump around this inst.

; Reset carry - disables SK in XAS

; instruction

; Bogus read - stops SK

; CS = 1, inactive; deselect CS5501

;

3366

DS31F54

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