參數(shù)資料
型號： MC68HC705E5P
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 133/148頁
文件大小： 3554K
代理商： MC68HC705E5P
Motorola Bus (M Bus) Interface
M-Bus Registers
MC68HC705E5 — Rev. 1.0
General Release Specification
Motorola Bus (M Bus) Interface
NON-DISCLOSURE
AGREEMENT
REQUIRED
MAL — Arbitration Lost Bit
MAL is set by hardware when the arbitration procedure is lost during
a master transmission. This bit must be cleared by software.
SRW — R/W Command Bit
When MAAS is set, the R/W command bit of the calling address (sent
from master) is latched into the R/W command bit (SRW). Checking
this bit, the CPU can select the slave transmit/receive mode
according to the command of master.
1 = Slave transmit, master reading from slave
0 = Slave receive, master writing to slave
MIF — M-Bus Interrupt Bit
MIF is set when an interrupt is pending. This will cause an M-bus
interrupt request provided MIEN is set. This bit is set when one of the
following events occurs:
–
Transmission of one byte is completed. The bit is set at the
falling edge of the ninth clock.
–
Reception of a calling address which matches its own specific
address in slave receive mode.
–
Arbitration is lost.
This bit must be cleared by writing a logic 0 to it.
RXAK — Receive Acknowledge Bit
If RXAK is low, it indicates an acknowledge signal has been received
after the completion of an 8-bit data transmission on the bus. If RXAK
is high, it means no acknowledge signal is detected at the ninth clock.
1 = No acknowledge received
0 = Acknowledge received
RXAK is set upon reset.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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