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this register must be read to request a byte from the slave
device. This prescribes a dummy read of this register to
start data flowing. Each operation will activate the PIN bit
located in the Two-Wire Control register [0xFD01/0xFD03
(ES0=1)].
Register: 0xFD01/0xFD03
Control Register Writes
Write Only
7
6
PIN
ES0
0
0
PIN
Pending Interrupt
Setting this bit clears the interrupt and all of the status
bits.
ES0
Enable Serial Output
This bit enables the Two-Wire Serial bus I/O. When low
(0), register access is available for initialization. If high
(1), then communication with the serial shift register S0
and status register S1 are accessible.
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.
5
4
3
ES1
ES2
ENI
Defaults:
0
0
0
ES1
ES2
0
0
1
0
0
0
2
1
STA
STO
0
0
Description
R/W Own Register
R/W Clock Register
R/W Data Register
register, if the Two-Wire Serial
Interrupt Mask (IMR)
0
ACK
0
7
6
[5:4]
3
6-5
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