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CHAPTER 18 DTP/EXTERNAL INTERRUPT CIRCUIT
18.1
Overview of the DTP/External Interrupt Circuit
The data transfer peripheral (DTP)/external interrupt circuit is located between external
peripherals and the F
2
MC-16LX CPU. It receives interrupt requests and data transfer
requests from peripherals and passes them to the CPU to generate external interrupt
requests or activate the extended intelligent I/O service (EI
2
OS).
■
DTP/external Interrupt Functions
The DTP/external interrupt circuit is activated by the signal supplied to a DTP/external interrupt pin. The
CPU accepts the signal using the same procedure it uses for normal hardware interrupts and generates
external interrupts or activates the extended intelligent I/O service (EI
2
OS).
If the extended intelligent I/O service (EI
2
OS) is disabled when an interrupt request is accepted by the
CPU, the circuit executes its external interrupt function and branches to an interrupt routine. If EI
2
OS is
enabled, the circuit executes its DTP function, which performs automatic data transfer using EI
2
OS and
branches to an interrupt processing routine after the data transfer has been performed a specified number of
times.
Table 18.1-1 provides an overview of the DTP/external interrupt circuit.
Table 18.1-1 Overview of the DTP/external Interrupt Circuit
External interrupt function
DTP function
Input pins
Eight (P10/INT0/DTTI0 to P16/INT6, P63/INT7)
Interrupt cause
By using the request level setting register (ELVR), the level or edge to be detected can be selected
for each pin
Input of H level or L level or rising edge or
falling edge
Input of H level or L level
Interrupt number
#20 (14
H
), #22 (16
H
), #25 (19
H
), #27 (1B
H
)
Interrupt control
The output of interrupt requests is enabled and disabled using the DTP/interrupt enable register
(ENIR)
Interrupt flag
Interrupt causes are stored in the DTP/interrupt cause register (EIRR)
Processing selection
EI
2
OS is disabled (ICR: ISE = 0)
EI
2
OS is enabled (ICR: ISE = 1)
Processing
The circuit branches to an external interrupt
processing routine
The circuit performs automatic data transfer
using EI
2
OS for a specified number of times
and then branches to an interrupt routine
ICR: Interrupt control register
Содержание MB90460 Series
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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