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ST7285C Datasheet(HTML) 60 Page - STMicroelectronics

Part No. ST7285C
Description  8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7285C Datasheet(HTML) 60 Page - STMicroelectronics

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ST7285C
I
2C BUS INTERFACE (Cont’d)
STATUS REGISTER 1 (SR1)
Address: 0029h
Read Only
Reset Value: 00h
b7: SR2F
Status Register 2 Flag
SR2F is set when at least one flag in the Status
Register 2 is set. It is cleared when all these flags
are reset.
b6: ADD10
10 bit Master Addressing Mode
ADD10 is set when the 10 bit addressing mode
header (”11110xxx”) is sent as the first address
byte. When this bit is set, an interrupt is sent to the
microcontroller if ITE is set
This bit is cleared by a read of the Status Register,
followed by a write in the Data Register. It is also
cleared when the peripheral is disabled (PE=0) or
by reset.
b5: TRA
Transmitter/Receiver
TRA is set when the interface is in data transmis-
sion mode.
It is cleared by the detection of a stop condition, by
a loss of the bus arbitration (ARLO set). It is also
cleared when the peripheral is disabled (PE=0) or
by reset.
b4: BUSY
Bus Busy
BUSY bit is active when there is a communication
in progress on line.
The detection of the communications is always ac-
tive (even if the peripheral s disabled).
This bit is set by the detection of a Start condition
and it is cleared by the detection of a Stop condi-
tion or by reset.
b3: BTF
Byte Transfer Finished
- In transmitter mode, BTF bit is set after the trans-
mission of a data byte and an acknowledge clock
pulse.
It is cleared by a read of the Status Register (with
BTF set), followed by a write in the Data Register.
In receiver mode, BTF bit is set after the reception
of the acknowledge of a byte.
It is cleared by a reading of the Status Register
(with BTF set), followed by a read of the Data Reg-
ister.
It is also cleared when the peripheral is disabled
(PE=0) or by reset.
When BTF is set, the I
2C interrupt occurs if ITE is
set. Then the microcontroller must access the data
register.
b2: ADSL
Addressed as Slave
ADSL bit is set when the address comparator rec-
ognizes either its own Slave address or the gener-
al call address. When this bit is set , an interrupt is
sent to the microcontroller if ITE is set.
This bit is cleared by a read of the status register
(when ADSL is set). It is also cleared when the pe-
ripheral is disabled (PE=0) or by reset.
b1: M/SL Master/Slave
M/SL bit is set when the interface generates a
Start condition. When it is set, the interface oper-
ates in Master mode.
It is cleared by the detection of a Stop condition,
by a loss of arbitration, by reset or when the pe-
ripheral is disabled (PE=0).
b0: SB
Start Bit ( in Master mode)
In Master mode , SB bit is set when the hardware
has generated a Start condition. When this bit is
set, an interrupt is sent to the microcontroller if ITE
is set. Then the microcontroller must write the ad-
dress byte in the data register.
This bit is cleared by a read of the status register
(when SB is set), followed by a write in the data
register. It is also cleared when the peripheral is
disabled (PE=0) or by reset.
70
SR2F
ADD10
TRA
BUSY
BTF
ADSL
M/SL
SB


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