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71M6545/71M6545H Data Sheet
Table 28: The T2CON Bit Functions (SFR 0xC8)
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
–
I3FR
I2FR
–
Symbol
–
–
IEX6
IEX5
IEX4
IEX3
IEX2
–
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 29: 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.
External MPU Interrupts
The seven external interrupts are the interrupts external to the 80515 core, i.e. signals that originate in
other parts of the 71M6545/H, for example the CE, DIO, RTC, or EEPROM interface.
The external interrupts are connected as shown in Table 30 . The polarity of interrupts 2 and 3 is
programmable in the MPU via the I3FR and I2FR bits in T2CON (SFR 0xC8) . Interrupts 2 and 3 should
be programmed for falling sensitivity ( I3FR = I2FR = 0). The generic 8051 MPU literature states that
interrupts 4 through 6 are defined as rising-edge sensitive. Thus, the hardware signals attached to
interrupts 5 and 6 are inverted to achieve the edge polarity shown in Table 30 .
Table 30: External MPU Interrupts
External
Interrupt
0
1
2
3
4
5
6
Connection
Digital I/O (IE0)
Digital I/O (IE1)
CE_PULSE (IE_XPULSE, IE_YPULSE, IE_WPULSE,
IE_VPULSE)
CE_BUSY (IE3)
VSTAT (VSTAT[2:0] changed) (IE4)
EEPROM busy (falling), SPI (rising) (IE_EEX, IE_SPI)
XFER_BUSY (falling), RTC_1SEC, RTC_1MIN, RTC_T
(IE_XFER, IE_RTC1S, IE_RTC1M, IE_RTCT)
Polarity
rising
falling
rising
–
falling
Flag Reset
automatic
automatic
manual
automatic
automatic
manual
manual
External interrupt 0 and 1 can be mapped to pins on the device using DIO resource maps.
42
v2
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