參數(shù)資料
型號： MC68HC705T16B
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封裝： PLASTIC, SDIP-56
文件頁數(shù)： 89/128頁
文件大?。?/td> 734K
代理商： MC68HC705T16B
MC68HC05T16
MOTOROLA
6-9
M-BUS SERIAL INTERFACE
6
SRW - Slave R/W Select
1 (set)
–
Read from slave, from calling master.
0 (clear) –
Write to slave from calling master.
When SELTED is set, the R/W command bit of the calling address sent from the master is latched
into this SRW bit. By checking this bit, the CPU can then select slave transmit/receive mode by
conguring XMT bit of the M-Bus Control register.
MIF - M-Bus Interrupt Flag
1 (set)
–
A M-Bus interrupt has occurred.
0 (clear) –
A M-Bus interrupt has not occurred.
When this bit is set, an interrupt is generated to the CPU if MIEN is set. This bit is set when one
of the following events occurs:
1) Completion of one byte of data transfer. It is set at the falling edge of the 9th
clock - MCF set.
2) A match of the calling address with its own specic address in slave receive
mode - SELTED set.
3) A loss of bus arbitration - ALOST set.
This bit must be cleared by software in the interrupt routine.
RXACKB - Receive Acknowledge Bit
1 (set)
–
No acknowledgment signal detected.
0 (clear) –
Acknowledgment signal detected after 8 bits data transmitted.
If cleared, it indicates an acknowledge signal has been received after the completion of 8 bits data
transmission on the bus. If set, no acknowledge signal has been detected at the 9th clock. This is
an active low status ag.
6.3.5
M-Bus Data I/O Register (MDR)
In master transmit mode, data written into this register is sent to the bus automatically, with the
most signicant bit out rst. In master receive mode, reading of this register initiates receiving of
the next byte data. In slave mode, the same function applies after it has been addressed.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$3B
MD7
MD6
MD5
MD4
MD3
MD2
MD1
MD0
uuuu uuuu
TPG
61
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