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7

The user can put channel select and ADC mode control data into the holding register within the microcontroller, via the

8-bit wide port A bidirectional I/O port, using a bank of eight toggle switches as shown in Figure 9. Alternatively, the

mode and channel data can be sent to the microcontroller holding register via the asynchronous serial communications

interface (SCI). This option is available only on those versions of the TMS370, such as the TMS370C020, which include

both SPI and SCI interfaces. Additional software to control the SCI must be appended to the software shown in List 1

to provide this method of control.

List 1

LINE LOC OBJ SOURCE

1 ;* * * * * * * * * * * * * * * *

2 ;* *

3 ;* TLC2543 to TMS 370Cx10 Interface Program *

4 ;* *

5 ;* This program reads channel select and mode *

6 ;* control data (provided by toggle switches) *

7 ;* into the microcontroller, using subroutine *

8 ;* DATAIN. *

9 ;* It then provides the control signals to *

10 ;* the TLC2543 to perform a 12 bit analog to *

11 ;* conversion, using subroutine ADC. It *

12 ;* finally stores the MSByte and LSByte of *

13 ;* each conversion in consecutive even and *

14 ;* odd number registers respectively starting *

15 ;* at R64 corresponding to channel 0, using *

16 ;* subroutine STORE. *

17 ;* * * * * * * * * * * * * * * *

18 0030 SPICCR .EQU P030 ;* * * * * * * *

19 0031 SPICTL .EQU P031 ;* *

20 0037 SPIBUF .EQU P037 ;* *

21 0039 SPIDAT .EQU P039 ;* *

22 003d SPIPC1 .EQU P03D ;* *

23 003e SPIPC2 .EQU P03E ;* Name Peripheral *

24 003f SPIPRI .EQU P03F ;* Registers *

25 0021 APORT2 .EQU P021 ;* *

26 0022 ADATA .EQU P022 ;* *

27 0023 ADIR .EQU P023 ;* *

28 002c DPORT1 .EQU P02C ;* *

29 002d DPORT2 .EQU P02D ;* *

30 002e DDATA .EQU P02E ;* *

31 002f DDIR .EQU P02F ;* * * * * * * *

32 7ffe RESET .EQU 7FFEH ;Reset vector named

33 2e CSBIT .DBIT 7,DDATA ;TLC2543 Chip Select bit

34 ;named CSBIT

35 ;

36 ;

37

38 4000 .TEXT 4000H ;Start program at 4000H

39 ;Main Program

40 4000 5260 START MOV #60H,B ;

41 4002 fd LDSP ;Set SP to address 60H

42 4003 * 88400000 MOVW #4000H,A

43 4007 8b7ffe MOV A,RESET ;Set reset vector

44 400a b5 CLR A

45 400b 2121 MOV A,APORT2

46 400d 2123 MOV A,ADIR

47 400f f7802f MOV #080H,DDIR

48 4012 2280 MOV #80H,A

49 4014 2130 MOV A,SPICCR

50 4016 2207 MOV #07,A ;Configure SPI for 8–bit

51 4018 2130 MOV A,SPICCR ;character length.

52 401a 2203 MOV #03,A ;Configure SPICLK

53 401c 213d MOV A,SPIPC1 ;function and direction.

54 401e 2222 MOV #22H,A ;Configure SPISOMI and

55 4020 213e MOV A,SPIPC2 ;SPISIMO pin functions.

56 31 SPIF .DBIT 6,SPICTL ;SPI INT FLAG named SPINTF

57 0b MSLSB .DBIT 1,R11 ;Bit 1 of R11 named MSLSB

58 4022 ’8e402d CALL DATAIN

59 4025 ’8e403e CALL ADC

60 4028 ’8e409d CALL STORE

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