Hyundai GMS90X54C, GMS90X51C, GMS90X52C user manual Interrupt Priority-Within-Level Interrupt Source

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HYUNDAI MicroElectronics

GMS90X5XC Series

Table 8. Interrupt Sources and their Corresponding Interrupt Vectors

Source (Request Flags)	Vectors	Vector Address

RESET	RESET	0000H
IE0	External interrupt 0	0003H
TF0	Timer 0 interrupt	000BH
IE1	External interrupt 1	0013H
TF1	Timer 1 interrupt	001BH
RI + TI	Serial port interrupt	0023H
TF2 + EXF2	Timer 2 interrupt	002BH

A low-priority interrupt can itself be interrupted by a high-priority interrupt, but not by another low priority in- terrupt. A high-priority interrupt cannot be interrupted by any other interrupt source.

If two requests of different priority level are received simultaneously, the request of higher priority is serviced. If requests of the same priority are received simultaneously, an internal polling sequence determines which re- quest is serviced. Thus within each priority level there is a second priority structure determined by the polling sequence as shown in Table 9.

Table 9. Interrupt Priority-Within-Level

Interrupt Source		Priority

External Interrupt 0	IE0	High
Timer 0 Interrupt	TF0	↓
External Interrupt 1	IE1	↓
Timer 1 Interrupt	TF1	↓
Serial Channel	RI + TI	↓
Timer 2 Interrupt	TF2 + EXF2	Low

22	Jan. 2001 Ver 1.0

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Contents GMS90X51C GMS90X52C GMS90X54C Page Mask Block Diagram GMS90C51CGMS90C52C/54C GMS90L52C/54CLow voltage versions PIN Configuration Plcc Pin Configuration top viewPdip Pin Configuration top view EA / VPP ALE / ProgMqfp Pin Configuration top view Logic Symbol PIN Definitions and Functions XTAL2Reset Symbol FunctionProgram Store Enable Pin NumberNo connection Address Latch EnableCircuit ground potential Block Diagram of the GMS90X5XC series Functional DescriptionCPU Special Function Register PSWSpecial Function Registers FFH D8H C0HD0H E0HF0H Contents of SFRs, SFRs in Numeric Order Address RegisterE0H D0HGF1 GF0 PDE Idle C8H T2CON TF2 EXF2 Rclk Tclk EXEN2 TR2 CP/RL2 X2 Mode Clock Generation DiagramMode Swithcing Waveforms Tmod Timer / Counter 0Timer/Counter 0 and 1 Operating Modes Description Input ClockP1.1 Remarks Input Clock TimerTimer/Counter 2 Operating Modes T2EXBaudrate Description Serial Interface UsartUsart Operating Modes SM0 SM1Interrupt System Interrupt Request SourcesInterrupt Priority-Within-Level Interrupt Source Power Saving Modes Electrical Characteristics Absolute Maximum RatingsPower supply current DC Characteristics for GMS90C51C/52C/54CParameter Symbol Limit Values Unit Test Conditions Min Hyundai MicroElectronics DC Characteristics for GMS90L51C/52C/54C VCC= 3.3V + 0.3V, -0.6V VSS=0V TA= 0C to 70CExternal Program Memory Characteristics Explanation of the AC SymbolsAC Characteristics for GMS90X5XC series 12MHz version GMS90X5XC Series Advance Information 12MHz External Clock Drive AC Characteristics for GMS90X5XC series 16MHz version Advance Information 16MHz External Clock Drive AC Characteristics for GMS90X5XC series 24MHz version Advance Information 24MHz External Clock Drive AC Characteristics for GMS90X5XC series 33MHz version Advance Information 33MHz External Clock Drive AC Characteristics for GMS90X5XC series 40MHz version Advance Information 40MHz External Clock Drive External Program Memory Read Cycle External Data Memory Read Cycle AC Testing Input, Output Waveforms Oscillator Circuit Plastic Package P-LCC-44 44PLCCPlastic Package P-DIP-40 Plastic Package P-MPQF-44 GMS90X5XC Series GMS90X5XC-GC ROM Protection