em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 99

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
Bit 6 (IMS):
Bit 5 (ISS):
Bit 4 (SOTP): In Master mode, if STOP=1 and R/nW=1, then EM78F648N/F548N
Bit 3 (SAR_EMPTY): Set when EM78F648N/F548N transmits 1 byte data from I2C
Bit 2 (ARK): The Ack condition bit is set to “1” by hardware when the device
Bit 1 (FULL): Set by hardware when I2C Receive (Rx) Buffer register is full. Resets
Bit 0 (EMPTY): Set by hardware when I2C Transmit (Tx) Buffer register is empty and
6.3.87 Bank1 R24: I2CCR2 (I2C Status and Control Register2)
Bit 7 (I2CBF): I2C Busy Flag bit
Bit 6 (GCEN): I2C General Call Function Enable bit
Bits 5~4:
I2CBF
Bit 7
GCEN
Bit 6
I2C Fast/Standard mode select bit (If Fm is 4MHz and I2CTS1~0<0,0>)
I2C Master/Slave mode select bit.
0: Slave
1: Master
0: Standard mode (100K bit/s)
1: Fast mode (400K bit/s)
must return nACK signal to Slave device before sending STOP signal.
If STOP=1 and R/nW=0, then EM78F648N/F548N sends STOP signal
after receiving an ACK signal. Resets when EM78F648N/F548N
sends STOP signal to Slave device.
In Slave mode, if STOP=1 and R/nW=0, then EM78F648N/F548N
must return nACK signal to Master device.
Slave Address Register and receive ACK (or nACK) signal. Resets
when MCU writes 1 byte data to I2C Slave Address Register.
responds acknowledge (ACK). Resets when the device responds with
a “not-acknowledge” (nACK) signal.
by hardware when MCU reads data from I2C Receive (Rx) Buffer
register.
receive ACK (or nACK) signal. Reset by hardware when MCU writes
new data to I2C Transmit (Tx) Buffer register.
0: Clear to “0” under Slave mode if the received STOP signal or I2C
1: Set when I2C communicate with Master in Slave mode.
0: Disable General Call Function
1: Enable General Call Function
Not used, fixed to “0” all the time.
Slave address does not match.
Bit 5
0
EM78F648/644/642/641/548/544/542/541N
Bit 4
0
I2CTS1
Bit 3
I2CTS0
Bit 2
8-Bit Microcontroller
Bit 1
0
I2CEN
Bit 0
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