參數(shù)資料
型號(hào)： MC68HC705CJ4FB
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, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 84/114頁
文件大小： 4047K
代理商： MC68HC705CJ4FB
GENERAL RELEASE SPECIFICATION
SLAVE-ONLY M-BUS
MC68HC(7)05CJ4
10-6
Rev. 2.1
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10.4 Slave M-Bus Status Register (MBSR)
SMF — Slave M-Bus Flag
This bit is set after the ninth clock of a valid transmission. A valid transmission
can be either a reception of a valid address following a start condition or
transmission/reception of data after the a valid address is recognized. If SMIE is
also set, an interrupt will be generated. This bit is cleared by first reading the
MBSR with SMF set, followed by reading or writing the M-bus address/data
register. SMF is also cleared when SME is cleared or by reset.
STDF — Start Detect Flag
This bit is set when a start condition is detected. It is provided as a means for
the user to distinguish between an address and a data transmission. No
interrupt is associated with this bit. Clearing STDF is done by first reading the
MBSR with STDF set, followed by reading or writing the M-bus address/data
register. STDF is also cleared when SME is cleared or by reset.
MACK — Master Acknowledge
This bit shows the status to the acknowledge during the master read (slave
write) operation. A Master ACKnowledge happens during the ninth-bit of a slave
transmission, when the slave releases the SDA line and the master holds it low.
When an acknowledge is sent by the master, MACK will be set (logic one): If the
master does not return any acknowledge, MACK will be cleared. This provides
a mean to detect if a master is signalling an end of transmission to the slave. No
interrupt is associated with this bit. Clearing MACK is done by first reading the
MBSR with MACK set, followed by reading or writing the M-bus data register.
MACK is also cleared when SME is cleared or by reset
NOTE
The other bits in this register (0–4) are not implemented and always
read as zero.
Bit 7
654321
Bit 0
$001E
MBSR
Read:
SMF
STDF
MACK
00000
Write:
Reset:
00000000
= Unimplemented
Figure 10-2. M-Bus Status Register
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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