UPD17073 NEC, UPD17073 Datasheet - Page 81

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UPD17073

Manufacturer Part Number
UPD17073
Description
4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
Manufacturer
NEC
Datasheet

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11.9.3 Interrupt control block
port when the interrupt function is not used.
interrupt request flag if the interrupt corresponding to the flag is not enabled.
11.10 Internal Interrupt
11.10.1 Interrupt by basic timer 1
11.10.2 Interrupt by serial interface
The level of a signal input to the INT pin can be detected by using the INT flag.
This flag is set or cleared independently of interrupts; therefore, it can be used as a 1-bit general-purpose input
The INT flag can also be used as a general-purpose port that can detect the rising or falling edge by reading an
In this case, however, the interrupt request flag is not automatically cleared and must be cleared by program.
Also refer to Figure 11-10.
Two internal interrupt sources, basic timer 1, and serial interface, are available.
This interrupt request is issued at fixed time intervals.
For details, refer to 12. TIMER.
This interrupt request is issued when a serial output or serial input operation has been completed.
For details, refer to 14. SERIAL INTERFACE.
Changes in IEG flag
(falling)
(rising)
1
0
0
1
(falling)
(rising)
Table 11-2. Issuing Interrupt Request By Changing IEG Flag
INT pin status
High level
High level
Low level
Low level
Interrupt request
Not issued
Not issued
Issued
Issued
Retains previous status
Retains previous status
PD17072,17073
IRQ flag status
Set to “1”
Set to “1”
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