SAH-C515 SIEMENS [Siemens Semiconductor Group], SAH-C515 Datasheet - Page 118

• Manufacturer Part Number: SAH-C515
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Special Function Register T2CON (Address C8 H )
Bit
I3FR
I2FR
The external interrupt 2 (INT2) can be either positive or negative transition-activated depending on
bit I2FR in register T2CON. The flag that actually generates this interrupt is bit IEX2 in register
IRCON. lf an interrupt 2 is generated, flag IEX2 is cleared by hardware when the service routine is
vectored to.
The external interrupt 3 (INT3) can be either positive or negative transition-activated, depending
on bit I3FR in register T2CON. The flag that actually generates this interrupt is bit IEX3 in register
IRCON. In addition, this flag will be set if a compare event occurs at pin P1.0/INT3/CC0, regardless
of the compare mode established and the transition at the respective pin. The flag IEX3 is cleared
by hardware when the service routine is vectored to.
Semiconductor Group
Bit No.
C8 H
The shaded bits are not used for interrupt control.
Function
External interrupt 3 rising/falling edge control flag
If I3FR = 0, the external interrupt 3 is activated by a falling edge at P1.0/INT3/CC0.
If I3FR = 1, the external interrupt 3 is activated by a rising edge at P1.0/INT3/CC0.
External interrupt 2 rising/falling edge control flag
If I2FR = 0, the external interrupt 2 is activated by a falling edge at P1.4/INT2.
If I2FR = 1, the external interrupt 2 is activated by a rising edge at P1.4/INT2.
T2PS
MSB
CF
H
I3FR
CE
H
I2FR
CD
H
T2R1
CC
H
7-7
T2R0
CB
H
T2CM
CA
H
T2I1
C9
H
LSB
T2I0
Interrupt System
C8
Reset Value : 00 H
H
T2CON
C515