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71M6543F/71M6543G Data Sheet
Table 27: The IEN2 Bit Functions (SFR 0x9A)
Bit
IEN2[0]
Bit
TCON[7]
TCON[6]
TCON[5]
TCON[4]
TCON[3]
TCON[2]
TCON[1]
TCON[0]
Bit
T2CON[7]
T2CON[6]
T2CON[5]
T2CON[4:0]
Bit
IRCON[7]
IRCON[6]
IRCON[5]
IRCON[4]
IRCON[3]
IRCON[2]
IRCON[1]
IRCON[0]
Symbol
ES1
Symbol
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
Symbol
–
I3FR
I2FR
–
Symbol
–
–
IEX6
IEX5
IEX4
IEX3
IEX2
–
Function
ES1 = 0 disables the serial channel 1 interrupt.
Table 28: TCON Bit Functions (SFR 0x88)
Function
Timer 1 overflow flag.
Not used for interrupt control.
Timer 0 overflow flag.
Not used for interrupt control.
External interrupt 1 flag.
External interrupt 1 type control bit:
0 = interrupt on low level.
1 = interrupt on falling edge.
External interrupt 0 flag
External interrupt 0 type control bit:
0 = interrupt on low level.
1 = interrupt on falling edge.
Table 29: The T2CON Bit Functions (SFR 0xC8)
Function
Not used.
Polarity control for INT3:
0 = falling edge.
1 = rising edge.
Polarity control for INT2:
0 = falling edge.
1 = rising edge.
Not used.
Table 30: The IRCON Bit Functions (SFR 0xC0)
Function
Not used.
Not used.
1 = External interrupt 6 flag.
1 = External interrupt 5 flag.
1 = External interrupt 4 flag.
1 = External interrupt 3 flag.
1 = External interrupt 2 flag.
Not used.
TF0 and TF1 (Timer 0 and Timer 1 overflow flags) is automatically cleared by hardware when the
service routine is called (Signals T0ACK and T1ACK – port ISR – active high when the service
routine is called). IE0, IE1, and IEX2-IEX6 are cleared automatically when hardware causes
execution to vector to the interrupt service routine.
v2
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