P8XC557E4 NXP Semiconductors, P8XC557E4 Datasheet - Page 38

• Manufacturer Part Number: P8XC557E4
• Description: The P80C557E4/P83C557E4/P89C557E4 (hereafter generically referred to as P8xC557E4) single-chip 8-bit microcontroller is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1999 Mar 02
Single-chip 8-bit microcontroller
CT0I
CT1I
CT2I
CT3I
INT0
INT1
UART
’seconds’
Serial
Request 0
Compare 0
Request 1
Compare 1
Compare 2
Capture 0
Interrupt
Capture 1
Capture 2
Capture 3
Overflow
Overflow
Port
Overflow
Interrupt
Interrupt
Timer T2
External
External
Interrupt
Timer 0
Timer 2
Timer 2
Timer 1
Timer 2
Timer 2
Timer 2
Timer 2
Timer 2
sources
Serial
ADC
Port
I
2
C
T
R
Source enable
Interrupt enable registers
Figure 35. The interrupt system.
Global enable
38
P83C557E4/P80C557E4/P89C557E4
Interrupt priority
registers
a1
a2
b1
b2
c1
c2
d1
d2
e1
e2
f1
f2
g1
g2
h1
h2
i1
i2
j1
j2
k1
k2
l1
l2
m1
m2
n1
n2
o1
o2
m1
m2
a1
b1
c1
d1
e1
f1
g1
h1
i1
j1
k1
l1
n1
o1
a2
b2
c2
d2
e2
f2
g2
h2
i2
j2
k2
l2
n2
o2
Polling hardware
Identification
Identification
Source
Source
Product specification
interrupt
interrupt
request
request
priority
priority
High
Low
Vector
Vector