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ES[1:2]
Register Selection Bits
These bits select the Two-Wire Serial register that is
read/written by accessing the Two-Wire Serial interface 0
register location.
ES0
0
0
1
ENI
External Interrupt Enable
Setting this bit enables the interrupt output to the
microcontroller when the PIN bit (0xFD01/0xFD03, bit 7)
is cleared (0). It causes the corresponding bit to be set in
the
Interrupt Status (ISR)
interrupt is not masked in the
register.
STA
Start
When set, this bit signifies that the byte located in the
Data register [0xFD00/0xFD02 (ES0, ES1, ES2 = 100]
will be sent out on the Two-Wire Serial bus with a start
condition as defined in the I
STO
Stop
When set, this bit signifies that a stop condition as
defined in the I
interface.
ACK
Acknowledge
When set, this bit will enable an ACK to be transmitted
during the ninth clock cycle of the interface after receiving
a data byte.
ES1
ES2 Description
0
0
R/W Own Register
1
0
R/W Clock Register
0
0
R/W Data Register
register, if the Two-Wire Serial
2
C specification will be sent out onto the
Interrupt Mask (IMR)
2
C specification.
[5:4]
3
2
1
0
6-7
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