6-7
ES[1:2]
Register Selection Bits
[5:4]
These bits select the Two-Wire Serial register that is
read/written by accessing the Two-Wire Serial interface 0
register location.
ENI
External Interrupt Enable
3
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
register, if the Two-Wire Serial
interrupt is not masked in the
register.
STA
Start
2
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
2
C specification.
STO
Stop
1
When set, this bit signifies that a stop condition as
defined in the I
2
C specification will be sent out onto the
interface.
ACK
Acknowledge
0
When set, this bit will enable an ACK to be transmitted
during the ninth clock cycle of the interface after receiving
a data byte.
ES0
ES1
ES2
Description
0
0
0
R/W Own Register
0
1
0
R/W Clock Register
1
0
0
R/W Data Register
Содержание Symbios SYM53C040
Страница 12: ...xii Preface...
Страница 90: ...4 18 SCSI and DMA Registers...
Страница 98: ...5 8 SFF 8067 Registers...
Страница 110: ...6 12 Two Wire Serial Registers...
Страница 126: ...7 16 Miscellaneous Registers...
Страница 160: ...8 34 System Registers...
Страница 184: ...9 24 Electrical Characteristics...
Страница 194: ...A 10 Register Summary...
Страница 214: ......