73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 36
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73S1217F-68MR/F/PE
Manufacturer Part Number
73S1217F-68MR/F/PE
Description
8-bit Microcontrollers - MCU
Manufacturer
Maxim Integrated
Datasheet
1.73S1217F-68MRFPE.pdf
(140 pages)
Specifications of 73S1217F-68MR/F/PE
Rohs
yes
Core
80515
Data Bus Width
8 bit
Part # Aliases
90-W1217+TF5
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1.7.5.1
When an interrupt occurs, the MPU will vector to the predetermined address as shown in Table 32. Once
the interrupt service has begun, it can only be interrupted by a higher priority interrupt. The interrupt
service is terminated by a return from the RETI instruction. When an RETI is performed, the processor
will return to the instruction that would have been next when the interrupt occurred.
When the interrupt condition occurs, the processor will also indicate this by setting a flag bit. This bit is
set regardless of whether the interrupt is enabled or disabled. Each interrupt flag is sampled once per
machine cycle, then samples are polled by the hardware. If the sample indicates a pending interrupt
when the interrupt is enabled, then the interrupt request flag is set. On the next instruction cycle, the
interrupt will be acknowledged by hardware forcing an LCALL to the appropriate vector address.
Interrupt response will require a varying amount of time depending on the state of the MPU when the
interrupt occurs. If the MPU is performing an interrupt service with equal or greater priority, the new
interrupt will not be invoked. In other cases, the response time depends on the current instruction. The
fastest possible response to an interrupt is 7 machine cycles. This includes one machine cycle for
detecting the interrupt and six cycles to perform the LCALL.
1.7.5.2
Interrupt Enable 0 Register (IEN0): 0xA8
36
IEN0.7
IEN0.6
IEN0.5
IEN0.4
IEN0.3
IEN0.2
IEN0.1
IEN0.0
Bit
Interrupt Overview
Special Function Registers for Interrupts
MSB
Symbol
WDT
EAL
ES0
ET1
EX1
ET0
EX0
EAL
–
EAL = 0 – disable all interrupts.
Not used for interrupt control.
ES0 = 0 – disable serial channel 0 interrupt.
ET1 = 0 – disable timer 1 overflow interrupt.
EX1 = 0 – disable external interrupt 1.
ET0 = 0 – disable timer 0 overflow interrupt.
EX0 = 0 – disable external interrupt 0.
WDT
–
Table 19: The IEN0 Register
ES0
0x00
ET1
Function
EX1
ET0
EX0
LSB
Rev. 1.2
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