155
SLEEP Bit – Multiprocessing Control
By using the SLEEP bit (SCICTL2), several microprocessors can be tied to common SCIRXD and
SCITXD lines. This example shows a slave microcontroller set to listen for its own address and load its
RAM with a block of data of a fixed size when it is addressed. The data is received through the use of an
interrupt routine. When the part recognizes its own address, it clears the SLEEP bit and subsequent
characters are loaded into memory starting at register DATA+BLOCKSIZE – 1 and continuing down to
register DATA. The SLEEP bit is then set and the routine waits for the next address.
Routine
B1200
.equ
2082
MOV
#007h,SCICCR
;l stop bit, no parity, isosynchronous,
; idle line protocol, 8–bit characters
MOV
#00h,SCICTL
;SCI SW RESET
MOV
#HI(B1200),BAUDMSB
;Set for 1200 baud @ 5 MHz.
MOV
#LO(B1200),BAUDLSB
;
MOV
#001h,RXCTL
;Enable SCIRX INT.
MOV
#002h,SCIPC2
;Set SCIRXD as input.
MOV
#060h,SCIPRI
;SCIRX/SCITX interrupts low priority.
MOV
#033h,SCICTL
;Release SCI, SLEEP=0,RXENA,TXENA.
....
;Main code here
RXINT
;Receiver interrupt routine
BTJZ
#004h,SCICTL,AWAKE
;If SLEEP=0, do not check address.
XOR
#ADDRESS,RXBUF
;Is address mine?
JNE DONE
;If not, go back to sleep.
MOV
#011h,SCICTL
;Clear SLEEP bit.
MOV
#BLOCKSIZE–1,BCOUNT ;Get size of block (-l for address).
JMP
DONE
;Address is mine, start reading data.
AWAKE
PUSH
B
;Save contents of A & B registers.
PUSH
A
MOV
BCOUNT,B
;Put pointer and data in temp registers.
MOV
RXBUF,A
MOV
A,DATA(B)
;Store character in DATAIN table.
POP
A
;Restore contents of A & B register.
POP
B
DJNZ
BCOUNT,DONE
;Wait for next character.
MOV
#015h,SCICTL
;Put part back to sleep.
DONE
RTI
;Return from interrupt.
*
Summary of Contents for TMS370 Series
Page 1: ...TMS370 Microcontroller Family Application Book 1996 8 Bit Microcontroller Family ...
Page 2: ...Printed in U S A February 1996 SPNA017 ...
Page 3: ...1996 Application TMS370 Microcontroller Family Book ...
Page 20: ...1 Part I Introduction ...
Page 21: ...2 ...
Page 22: ...3 Introduction Microcontroller Products Semiconductor Group Texas Instruments ...
Page 23: ...4 ...
Page 25: ...6 ...
Page 27: ...8 ...
Page 29: ...10 ...
Page 31: ...12 ...
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Page 39: ...20 ...
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Page 43: ...24 ...
Page 45: ...26 ...
Page 47: ...28 ...
Page 49: ...30 ...
Page 81: ...62 ...
Page 82: ...63 Clear RAM Microcontroller Products Semiconductor Group Texas Instruments ...
Page 83: ...64 ...
Page 85: ...66 ...
Page 86: ...67 RAM Self Test on the TMS370 Microcontroller Products Semiconductor Group Texas Instruments ...
Page 87: ...68 ...
Page 89: ...70 ...
Page 90: ...71 ROM Checksum on the TMS370 Microcontroller Products Semiconductor Group Texas Instruments ...
Page 91: ...72 ...
Page 95: ...76 ...
Page 97: ...78 ...
Page 98: ...79 Bubble Sort With the TMS370 Microcontroller Products Semiconductor Group Texas Instruments ...
Page 99: ...80 ...
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Page 324: ...305 T1PWM Set Up Routines Microcontroller Products Semiconductor Group Texas Instruments ...
Page 325: ...306 ...
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Page 396: ...377 PACT Command Macros Microcontroller Products Semiconductor Group Texas Instruments ...
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Page 492: ...473 Part V External Memory Expansion Examples ...
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