P87C554 NXP Semiconductors, P87C554 Datasheet - Page 46

• Manufacturer Part Number: P87C554
• Description: The P87C554 Single-Chip 8-Bit Microcontroller is manufactured inan advanced CMOS process and is a derivative of the 80C51microcontroller family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 7.
2002 Mar 25
STATUS
STATUS
(S1STA)
(S1STA)
80C51 8-bit microcontroller – 12 clock operation
16K/512 OTP/RAM, 8 channel 10-bit A/D, I
capture/compare, high I/O
CODE
08H
10H
38H
40H
48H
50H
58H
A START condition has
been transmitted
A repeated START
condition has been
transmitted
Arbitration lost in
NOT ACK bit
SLA+R has been
transmitted; ACK has
b
been received
SLA+R has been
t
transmitted; NOT ACK
has been received
Data byte has been
received; ACK has been
returned
Data byte has been
received; NOT ACK has
been returned
STATUS OF THE I
STATUS OF THE I
Master Receiver Mode
SIO1 HARDWARE
SIO1 HARDWARE
diti
i
itt d NOT ACK
BUS AND
d
d NOT ACK h
h
i
d
b
2
2
C
C
Load SLA+R
Load SLA+R or
Load SLA+W
No S1DAT action or
No S1DAT action
No S1DAT action or
no S1DAT action
No S1DAT action or
no S1DAT action or
no S1DAT action
Read data byte or
read data byte
Read data byte or
read data byte or
read data byte
TO/FROM S1DAT
TO/FROM S1DAT
APPLICATION SOFTWARE RESPONSE
2
C, PWM,
STA
X
X
X
0
1
0
0
1
0
1
0
0
1
0
1
44
STO
TO S1CON
0
0
0
0
0
0
0
0
1
1
0
0
0
1
1
SI
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
AA
X
X
X
X
X
0
1
X
X
X
0
1
X
X
X
SLA+R will be transmitted;
ACK bit will be received
As above
SLA+W will be transmitted;
SIO1 will be switched to MST/TRX mode
I
SIO1 will enter a slave mode
A START condition will be transmitted when the
bus becomes free
Data byte will be received;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
Repeated START condition will be transmitted
STOP condition will be transmitted;
STO flag will be reset
STOP condition followed by a
START condition will be transmitted;
STO flag will be reset
Data byte will be received;
NOT ACK bit will be returned
Data byte will be received;
ACK bit will be returned
Repeated START condition will be transmitted
STOP condition will be transmitted;
STO flag will be reset
STOP condition followed by a
START condition will be transmitted;
STO flag will be reset
NEXT ACTION TAKEN BY SIO1 HARDWARE
2
C bus will be released;
P87C554
Product data