HMS99C52 Datasheet, PDF (25/43 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

HMS99C5X Series
INTERRUPT SYSTEM
The HMS99C5X series provides 5 (4K bytes ROM version) or 6 (above 8K bytes ROM version) interrupt sourc-
es with two priority levels. Figure 5 gives a general overview of the interrupt sources and illustrates the request
and control flags.
Timer 0 Overflow
TF0
TCON.5
ET0
PT0
IE.1
IP.1
Timer 1 Overflow
TF1
TCON.7
ET1
PT1
IE.3
IP.3
Timer 2 Overflow
TF2
≥1
T2CON.7
P1.1/
T2EX
EXF2
ET2
PT2
T2CON.6
IE.5
IP.5
EXEN2
T2CON.3
RI
≥1
UART ^SCON.0
TI
ES
PS
SCON.1
IE.4
IP.4
P3.2/
INT0
IT0
TCON.0
IE0
TCON.1
EX0
PX0
IE.0
IP.0
P3.3/
INT1
IT1
TCON.2
IE1
TCON.3
EX1
EA
PX1
IE.2
IE.7
IP.2
High
Priority
Low
Priority
: Low level triggered
: Falling edge triggered
Figure 5. Interrupt Request Sources
Jan. 2003 Ver 1.0
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