C501G-1E SIEMENS [Siemens Semiconductor Group], C501G-1E Datasheet - Page 80
C501G-1E
Manufacturer Part Number
C501G-1E
Description
8-Bit Single-Chip Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.C501G-1E.pdf
(121 pages)
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7.1
7.1.1 Interrupt Enable Register
Each interrupt vector can be individually enabled or disabled by setting or clearing the
corresponding bit in the interrupt enable register IE (interrupt enable) or T2CON. This register also
contains the global disable bit (EA), which can be cleared to disable all interrupts at once. Generally,
after reset all interrupt enable bits are set to 0. That means that the corresponding interrupts are
disabled.
Special Function Register IE (Address A8 H )
Bit
EA
–
ET2
ES
ET1
EX1
ET0
EX0
Semiconductor Group
Interrupt Registers
Bit No.
A8 H
The shaded bit is not used for interrupt control.
Function
Enable/disable all interrupts.
If EAL=0, no interrupt will be acknowledged.
If EAL=1, each interrupt source is individually enabled or disabled by setting or
clearing its enable bit.
Not implemented. Reserved for future use.
Timer 2 overflow / external reload interrupt enable.
If ET2 = 0, the timer 2 interrupt is disabled.
If ET2 = 1, the timer 2 interrupt is enabled.
Serial channel (USART) interrupt enable
If ES = 0, the serial channel interrupt 0 is disabled.
If ES = 1, the serial channel interrupt 0 is enabled.
Timer 1 overflow interrupt enable.
If ET1 = 0, the timer 1 interrupt is disabled.
If ET1 = 1, the timer 1 interrupt is enabled.
External interrupt 1 enable.
If EX1 = 0, the external interrupt 1 is disabled.
If EX1 = 1, the external interrupt 1 is enabled.
Timer 0 overflow interrupt enable.
If ET0 = 0, the timer 0 interrupt is disabled.
If ET0 = 1, the timer 0 interrupt is enabled.
External interrupt 0 enable.
If EX0 = 0, the external interrupt 0 is disabled.
If EX0 = 1, the external interrupt 0 is disabled.
MSB
EA
AF
H
AE
–
H
ET2
AD
H
ES
AC
7-2
H
ET1
AB
H
EX1
AA
H
ET0
A9
Reset Value : 0X000000 B
H
Interrupt System
LSB
EX0
A8
H
IE
C501
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