p87c453ebaa NXP Semiconductors, p87c453ebaa Datasheet - Page 7

• Manufacturer Part Number: p87c453ebaa
• Description: 80c51 8-bit Microcontroller Family 8k/256 Otp/rom, Expanded I/o
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1998 Apr 23
80C51 8-bit microcontroller family
8K/256 OTP/ROM, expanded I/O
OBF
IBF
INT0
INT1
TF0
TF1
TI
RI
BIT
IE.7
IE.6
IE.5
IE.4
IE.3
IE.2
IE.1
IE.0
0
1
0
1
IT0
IT1
SYMBOL
EA
IOB
IIB
ES
ET1
EX1
ET0
EX0
MSB
INDIVIDUAL
ENABLES
EA
FUNCTION
Disables all interrupts. If EA=0, no interrupt will be acknowledged. If EA=1, each interrupt
source is individually enabled or disabled by setting or clearing its enable bit.
Enables or disables the Output Buffer Full (OBF) interrupt. If IOB=0, the interrupt is disabled,
If IOB=1, an interrupt will occur if EA is set and data has been read from the output buffer
register through Port 6 by the external host pulsing ODS low.
Enables or disables the Input Buffer Full (IBF) interrupt. If IIB=0, the interrupt is disabled. If
IIB=1, an interrupt will occur if EA is set and data has been written into the Port 6 Input Data
Buffer by the host strobing IDS low.
Enables or disables the Serial Port Interrupt. If ES=0, the Serial Port Interrupt. If ES=0, the
Serial Port interrupt is disabled.
Enables or disables the Timer 1 Overflow interrupt. If ET1=0, the Timer 1 interrupt is disabled.
Enables or disables External Interrupt 1. If EX1=0, External Interrupt 1 is disabled.
Enables or disables the Timer 0 Overflow interrupt. If ET0=0, the Timer 0 interrupt is disabled.
Enables or disables External Interrupt 0. If EX0=0, external Interrupt 0 is disabled.
IE.0
IE.1
IE.2
IE.3
IE.4
IE.5
IE.6
IOB
Figure 2. 8XC453 Interrupt Enable (IE) Register
Figure 1. 8XC453 Interrupt Control System
IE REGISTER
IIB
ES
7
DISABLE
GLOBAL
ET1
IP REGISTER
EX1
ET0
EX0
LSB
83C453/87C453
Preliminary specification
HIGH PRIORITY
INTERRUPT
SU00563
INTERRUPT
SEQUENCE
LOW PRIORITY
POLLING
INTERRUPT
SU00562