p89c538nbbb NXP Semiconductors, p89c538nbbb Datasheet - Page 14

• Manufacturer Part Number: p89c538nbbb
• Description: Cmos Single-chip 8-bit Microcontrollers With Flash Program Memory
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1997 Jun 05
CMOS single-chip 8-bit microcontrollers
with FLASH program memory
BIT
IE.7
IE.6
IE.5
IE.4
IE.3
IE.2
IE.1
IE.0
BIT
IP.7
IP.6
IP.5
IP.4
IP.3
IP.2
IP.1
IP.0
IE (0A8H)
IP (0B8H)
SYMBOL
EA
—
ET2
ES
ET1
EX1
ET0
EX0
SYMBOL
—
—
PT2
PS
PT1
PX1
PT0
PX0
Enable Bit = 1 enables the interrupt.
Enable Bit = 0 disables it.
Priority Bit = 1 assigns higher priority
Priority Bit = 0 assigns lower priority
FUNCTION
Global disable bit. If EA = 0, all interrupts are disabled. If EA = 1, each interrupt can be individually
enabled or disabled by setting or clearing its enable bit.
Not implemented.
Timer 2 interrupt enable bit.
Serial Port interrupt enable bit.
Timer 1 interrupt enable bit.
External interrupt 1 enable bit.
Timer 0 interrupt enable bit.
External interrupt 0 enable bit.
FUNCTION
Not implemented, reserved for future use.
Not implemented, reserved for future use.
Timer 2 interrupt priority bit.
Serial Port interrupt priority bit.
Timer 1 interrupt priority bit.
External interrupt 1 priority bit.
Timer 0 interrupt priority bit.
External interrupt 0 priority bit.
EA
—
7
7
—
—
6
6
ET2
PT2
5
5
Figure 6.
Figure 7.
ES
PS
4
4
14
IE Registers
IP Registers
ET1
PT1
3
3
EX1
PX1
2
2
ET0
PT0
1
1
89C535/89C536/89C538
EX0
PX0
0
0
Preliminary specification
SU00571
SU00572