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參數(shù)資料
| 型號(hào)： | 8044 |
| 廠商： | Intel Corp. |
| 英文描述： | CHMOS Single-Chip 8-Bit Microcontroller(CHMOS 單片、8位微控制器) |
| 中文描述： | CHMOS單片8位微控制器（CHMOS單片，8位微控制器） |
| 文件頁數(shù)： | 20/36頁 |
| 文件大小： | 616K |
| 代理商： | 8044 |
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FLEXIBILITY IN FRAME SIZE WITH THE 8044
292019–17
Transmit Subroutine
Figure 15. Secondary Station Flow Charts
3) Monitor the SIUST register for the standby mode in
the DMA-LOOP state (SIUST
e
B0H). When
SIUST is B0H, the opening flag has been transmit-
ted, and the first information byte is being transmit-
ted by the bit processor.
4) If there are more information bytes, move the byte
processor back to the CONTROL state, and repeat
steps 2 through 4. Otherwise, continue.
5) Move byte processor to the Standby mode in the
CONTROL state (SIUST
e
A8H) and return from
the subroutine.
The byte processor automatically executes the remain-
ing states to send the FCS bytes and the closing flag.
After the completion of transmission, SIU updates the
STS and NSNR registers and interrupts the CPU.
If the contents of the TBL register were more than 1,
the SIU transmits (TBL)
b
1 additional bytes from the
internal RAM at starting address (TBS)
a
1 because it
executes the DMA-LOOP state (TBL)
b
1 additional
times. The byte processor should not be programmed to
skip the DMA-LOOP state, because the transmission of
FCS bytes is enabled in this state.
The maximum baud rate that can be used with these
codes is calculated by adding the number of instruction
cycles executed, during the standby mode, between
each byte boundaries (see Table 2).
Using Equation 1, the maximum data rate, based on the
transmit software, is 509 Kbps; However, the maxi-
mum count rate of the counter limits the data rate to
500 Kbps.
Table 2. Codes for Long Frame Transmission
Transmit Codes
Cycles
#
#
#
#
#
#
TRAN:
MOV
MOV
SETB
SETB
MOVX
MOV
MOV
CJNE
INC
MOVX
MOV
DJNZ
MOV
RET
MOV
MOV
JMP
DPTR,
Y
200H
R5,
Y
0FFH
TBF
RTS
A,
@
DPTR
@
R1,A
A,
Y
0B0H
A,SIUST,WAIT1àààààààààààààààààààà2
DPTRààààààààààààààààààààààààààààà2
A,
@
DPTR ààààààààààààààààààààààààà2
@
R1,A ààààààààààààààààààààààààààà1
R5,NEXTIààààààààààààààààààààààààà2
SIUST,
Y
57H
LOOP:
WAIT1:
NEXTI:
SIUST,
Y
57H àààààààààààààààààààààà2
A,
Y
0B0H ààààààààààààààààààààààààà1
WAIT1àààààààààààààààààààààààààààà1
END
13 Cycles
16
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