em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 100

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

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
90 •
Bits 3~2 (I2CTS1~I2CTS0): I2C Transmit Clock Source Select bits (When I2CCS=0).
Bit 1:
Bit 0 (I2CEN): I2C Enable Bit
6.3.88 Bank1 R25: I2CSA (I2C Slave Address Register)
Bits 7~1 (SA6~SA0): When EM78F648N/F548N is used as Master device for I2C
Bit 0 (IRW):
6.3.89 Bank1 R26: I2CDA (I2C Device Address Register)
Bits 7~0 (DA7~DA0): When EM78F648N/F548N is used as Slave device for I2C
Bit 7
Bit 7
SA6
DA7
Bit 6
Bit 6
SA5
DA6
When operating under different Fm, these bits must be set to correct
value to let SCL clock match with Standard/Fast mode.
I2CCR1 Bit5=0, Standard mode:
I2CCR1 Bit5=1, Fast mode:
Not used, fixed to “0” all the time.
0: Disable I2C mode
1: Enable I2C mode
application, this is the Slave device address register.
When EM78F648N is used as Master device for I2C application, this
bit is Read/Write transaction control bit.
0: Write
1: Read
application, this register stores the address of EM78F648N/F548N. It
is used to identify the data on the I2C bus and to extract the message
delivered to the EM78F648N/F548N.
I2CTS1
I2CTS1
0
0
1
1
0
0
1
1
Bit 5
Bit 5
DA5
SA4
I2CTS0
I2CTS0
0
1
0
1
0
1
0
1
Bit 4
Bit 4
DA4
SA3
(This specification is subject to change without further notice)
SCL CLK
SCL CLK
Fm/120
Fm/160
Fm/40
Fm/80
Fm/10
Fm/20
Fm/30
Fm/40
Bit 3
Bit 3
DA3
SA2
Product Specification (V1.0) 05.05.2010
Bit 2
Bit 2
DA2
SA1
Operating Fm(MHz)
Operating Fm(MHz)
Bit 1
Bit 1
DA1
SA0
12
16
12
16
4
8
4
8
Bit 0
Bit 0
IRW
DA0