P87C52 PHILIPS [NXP Semiconductors], P87C52 Datasheet - Page 34

• Manufacturer Part Number: P87C52
• Description: 80C51 8-bit microcontrollers 16K/32K, 512 OTP, I2C, watchdog timer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
2003 Jan 24
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
IPH
IP
IE
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
BIT
IPH.7
IPH.6
IPH.5
IPH.4
IPH.3
IPH.2
IPH.1
IPH.0
Address = B7H
Bit Addressable
Address = 0B8H
Bit Addressable
Address = 0A8H
Bit Addressable
SYMBOL
EA
—
ET2
ES
ET1
EX1
ET0
EX0
SYMBOL
—
—
PT2
PS
PT1
PX1
PT0
PX0
SYMBOL
—
—
PT2H
PSH
PT1H
PX1H
PT0H
PX0H
Enable Bit = 1 enables the interrupt.
Enable Bit = 0 disables it.
Priority Bit = 1 assigns higher priority
Priority Bit = 0 assigns lower priority
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. Reserved for future use.
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.
FUNCTION
Not implemented, reserved for future use.
Not implemented, reserved for future use.
Timer 2 interrupt priority bit high.
Serial Port interrupt priority bit high.
Timer 1 interrupt priority bit high.
External interrupt 1 priority bit high.
Timer 0 interrupt priority bit high.
External interrupt 0 priority bit high.
EA
—
—
7
7
7
—
—
—
6
6
6
Figure 24. Interrupt Priority HIGH (IPH) Register
Figure 23. Interrupt Priority (IP) Register
Figure 22. Interrupt Enable (IE) Register
PT2H
ET2
PT2
5
5
5
PSH
ES
PS
4
4
4
34
PT1H
ET1
PT1
3
3
3
PX1H
EX1
PX1
2
2
2
PT0H
ET0
PT0
1
1
1
P80C3xX2; P80C5xX2;
SU01523
PX0H
EX0
PX0
0
0
0
SU01524
Reset Value = xx000000B
Reset Value = xx000000B
Reset Value = 0X000000B
P87C5xX2
SU01522
Product data