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6 INITERRUPT CONTROLLER
S1C17001 TECHNICAL MANUAL
EPSON
35
Level trigger mode
In level trigger mode, the ITC samples the interrupt signal continuously using the system clock rising edge. The in-
terrupt flag (EIFT
x
) is set to 1 if High level is detected and is reset to 0 if Low level is subsequently detected. Since
interrupt flags (EIFT
x
) cannot be reset by writing 1 in this mode, the interrupt signal is held at High until the inter-
rupt source module is accepted by the S1C17 core, and the interrupt signal must subsequently be cleared.
pclk
Interrupt signal set to inactive by interrupt source
Interrupt signal from
interrupt source
Interrupt flag within ITC
Figure 6.3.5.2: Level trigger mode
Note: The S1C17001 interrupts listed below are in level trigger mode. The interrupt flag within pe-
ripheral modules must be reset (to 1) within the interrupt processing routine rather than EIFT
x
• P0 port interrupt
• P1 port interrupt
• Stopwatch timer interrupt
• Clock timer interrupt
• 8-bit OSC1 timer interrupt
• PWM & capture timer interrupt
For more information on interrupt flags for resetting, refer to the peripheral module descrip-
tion.
Summary of Contents for S1C17001
Page 1: ...Technical Manual S1C17001 CMOS 16 BIT SINGLE CHIP MICROCONTROLLER ...
Page 33: ...4 POWER SUPPLY VOLTAGE 24 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 63: ...6 INITERRUPT CONTROLLER 54 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 87: ...8 CLOCK GENERATOR CLG 78 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 91: ...9 PRESCALER PSC 82 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 133: ...11 16 BIT TIMER T16 124 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 211: ...16 STOPWATCH TIMER SWT 202 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 219: ...17 WATCHDOG TIMER WDT 210 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 241: ...18 UART 232 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 277: ...20 I2 C 268 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Page 313: ...25 PACKAGE 304 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...