
10-29
ML63326 User's Manual
Chapter 10 Ports (INPUT, OUTPUT, I/O PORT)
10
10.6.3 Port B External Interrupt Function (External Interrupt 0)
Port B has external interrupt 0 allocated as secondary function. Individual bits of port B can
be enabled/disabled.
External interrupt generation for port B is triggered by the falling edge of the 128 Hz or 4 kHz
time base counter, which is the sampling clock.
After the port level changes, the interrupt request signal (XI0INT) is output, and the interrupt
request flag (QXI0) is set. The maximum delay for this sequence is one cycle of the sampling
clock (128 Hz or 4 kHz).
Because the port B external interrupt is set by a level change at any of the port B inputs, each
bit of the port must be read to determine which bit of port B generated the interrupt.
The interrupt start address for external interrupt 0 is 0014H.
Figure 10-10 shows the external interrupt 0 generation timing.
Figure 10-11 shows the equivalent circuit for external interrupt 0 control.
Level change
detect circuit
128 Hz
4 kHz
PBMOD
PBF
PB0IE
PB1IE
PB2IE
PB3IE
PBIE
PB.0
PB.1
PB.2
PB.3
IE0.2
EXI0
to interrupt priority
encoder
IRQ0
IE0
IRQ0.2
QXI0
XI0INT
QXI0
(n = 0–3)
XI0INT
PB.n
128 Hz or
4 kHz
Figure 10-10 External Interrupt 0 Generation Timing
Figure 10-11 External Interrupt 0 Control Equivalent Circuit
Summary of Contents for ML63326
Page 3: ......
Page 13: ......
Page 14: ...Chapter 1 Overview 1 ...
Page 15: ......
Page 37: ...1 22 ML63326 User s Manual Chapter 1 Overview ...
Page 38: ...Chapter 2 CPU and Memory Spaces 2 ...
Page 39: ......
Page 50: ...CPU Control Functions Chapter 3 3 ...
Page 51: ......
Page 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Page 58: ...Interrupt INT326 Chapter 4 4 ...
Page 59: ......
Page 71: ...4 12 ML63326 User s Manual Chapter 4 Interrupt INT326 ...
Page 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
Page 73: ......
Page 83: ...5 10 ML63326 User s Manual Chapter 5 Clock Generator Circuit OSC ...
Page 84: ...Time Base Counter TBC Chapter 6 6 ...
Page 85: ......
Page 90: ...Timers TIMER Chapter 7 7 ...
Page 91: ......
Page 115: ...7 24 ML63326 User s Manual Chapter 7 Timers TIMER ...
Page 116: ...Chapter 8 8 100 Hz Timer Counter 100HzTC ...
Page 117: ......
Page 121: ...8 4 ML63326 User s Manual Chapter 8 100 Hz Timer Counter 100HzTC ...
Page 122: ...Chapter 9 9 Watchdog Timer WDT ...
Page 123: ......
Page 128: ...Chapter 10 10 Ports INPUT OUTPUT I O PORT ...
Page 129: ......
Page 170: ...Chapter 11 11 External Memory Transfer Function EXTMEM ...
Page 171: ......
Page 179: ...11 8 ML63326 User s Manual Chapter 11 External Memory Transfer Function EXTMEM ...
Page 180: ...Chapter 12 12 Melody Driver MELODY63K ...
Page 181: ......
Page 195: ...12 14 ML63326 User s Manual Chapter 12 Melody Driver MELODY63K ...
Page 196: ...13 Chapter 13 Voice Synthesis ...
Page 197: ......
Page 228: ...14 Chapter 14 Shift Register SFT ...
Page 229: ......
Page 236: ...15 Chapter 15 LCD Driver LCD ...
Page 237: ......
Page 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
Page 251: ......
Page 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Page 256: ...Chapter 17 17 Power Supply Circuit POWER ...
Page 257: ......
Page 260: ...Appendixes ...
Page 261: ......
Page 321: ...Appendix 60 ML63326 User s Manual Appendix G ...