Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I2C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
P87C552
Table 8.
Slave Receiver Mode (Continued)
APPLICATION SOFTWARE RESPONSE
STATUS
CODE
(S1STA)
STATUS OF THE
I C BUS AND
SIO1 HARDWARE
2
TO S1CON
NEXT ACTION TAKEN BY SIO1 HARDWARE
TO/FROM S1DAT
STA STO
SI
AA
No STDAT action or
No STDAT action or
0
0
0
0
0
0
Switched to not addressed SLV mode; no recognition
of own SLA or General call address
Switched to not addressed SLV mode; Own SLA will
be recognized; General call address will be
recognized if S1ADR.0 = logic 1
A0H
A STOP condition or
repeated START
condition has been
received while still
addressed as
0
0
1
0
SLV/REC or SLV/TRX
No STDAT action or
No STDAT action
1
1
0
0
Switched to not addressed SLV mode; no recognition
of own SLA or General call address. A START
condition will be transmitted when the bus becomes
free
Switched to not addressed SLV mode; Own SLA will
be recognized; General call address will be
0
1
recognized if S1ADR.0 = logic 1. A START condition
will be transmitted when the bus becomes free.
Table 9.
Slave Transmitter Mode
APPLICATION SOFTWARE RESPONSE
STATUS
CODE
(S1STA)
STATUS OF THE
I C BUS AND
SIO1 HARDWARE
2
TO S1CON
NEXT ACTION TAKEN BY SIO1 HARDWARE
TO/FROM S1DAT
STA STO
SI
AA
Load data byte or
X
0
0
0
Last data byte will be transmitted and ACK bit will be
received
Data byte will be transmitted; ACK will be received
A8H
B0H
Own SLA+R has
been received; ACK
has been returned
load data byte
X
X
0
0
0
0
1
0
Load data byte or
Last data byte will be transmitted and ACK bit will be
received
Arbitration lost in
SLA+R/W as master;
Own SLA+R has
been received, ACK
has been returned
load data byte
X
X
0
0
0
0
1
0
Data byte will be transmitted; ACK bit will be received
Load data byte or
Last data byte will be transmitted and ACK bit will be
received
B8H
C0H
Data byte in S1DAT
has been transmitted;
ACK has been
load data byte
X
0
0
0
0
0
1
Data byte will be transmitted; ACK bit will be received
received
No S1DAT action or
01 Switched to not addressed SLV mode; no recognition
of own SLA or General call address
1
Data byte in S1DAT
has been transmitted;
NOT ACK has been
received
no S1DAT action or
no S1DAT action or
0
1
0
0
0
0
Switched to not addressed SLV mode; Own SLA will
be recognized; General call address will be
recognized if S1ADR.0 = logic 1
0
Switched to not addressed SLV mode; no recognition
of own SLA or General call address. A START
condition will be transmitted when the bus becomes
free
no S1DAT action
1
0
0
1
Switched to not addressed SLV mode; Own SLA will
be recognized; General call address will be
recognized if S1ADR.0 = logic 1. A START condition
will be transmitted when the bus becomes free.
No S1DAT action or
no S1DAT action or
0
0
0
0
0
0
0
1
Switched to not addressed SLV mode; no recognition
of own SLA or General call address
Switched to not addressed SLV mode; Own SLA will
be recognized; General call address will be
recognized if S1ADR.0 = logic 1
C8H
Last data byte in
S1DAT has been
transmitted (AA = 0);
ACK has been
received
no S1DAT action or
no S1DAT action
1
1
0
0
0
0
0
1
Switched to not addressed SLV mode; no recognition
of own SLA or General call address. A START
condition will be transmitted when the bus becomes
free
Switched to not addressed SLV mode; Own SLA will
be recognized; General call address will be
recognized if S1ADR.0 = logic 1. A START condition
will be transmitted when the bus becomes free.
46
1999 Mar 30
NXP [ NXP ]
