Oki MSM80C154S, MSM83C154S Interrupt priority register IP, Priority is assigned when bit is, Pct

Page 16

MSM80C154S/83C154S									¡ Semiconductor
Interrupt priority register (IP)

NAME	ADDRESS	MSB									LSB
NAME	ADDRESS	7	6	5	4		3		2	1	0
		7	6	5	4		3		2	1	0

IP	0B8H	PCT	—	PT2	PS		PT1		PX1	PT0	PX0

BIT LOCATION	FLAG				FUNCTION

IP.0	PX0	Interrupt priority bit for external interrupt 0.
		Priority is assigned when bit is "1".

IP.1	PT0	Interrupt priority bit for timer interrupt 0.
		Priority is assigned when bit is "1".

IP.2	PX1	Interrupt priority bit for external interrupt 1.
		Priority is assigned when bit is "1".

IP.3	PT1	Interrupt priority bit for timer interrupt 1.
		Priority is assigned when bit is "1".

IP.4	PS	Interrupt priority bit for serial port.
		Priority is assigned when bit is "1".

IP.5	PT2	Interrupt priority bit for timer interrupt 2.
		Priority is assigned when bit is "1".

IP.6	—	Reserved bit. The output data is "1" if the bit is read.

IP.7	PCT	Priority interrupt circuit control bit.
		The priority register contents are valid and priority assigned interrupts can be
		processed when this bit is "0". When the bit is "1", the priority interrupt circuit is
		stopped, and interrupts can only be controlled by the interrupt enable register (IE).

274

Image 16

Contents Features General Description¡SemiconductorSemiconductor MSM80C154S/83C154S Cmos 8-bit MicrocontrollerMSM80C154S/83C154S ¡ SemiconductorSignal TIMER/COUNTER 0 Interrupt2PORT Address DecoderPin Plastic DIP PIN Configuration TOP ViewPsen Reset Pin Plastic QFP44 P1.4 P1.5 P1.6 P1.7 25 P2.7 24 P2.6 23 P2.5 P2.4Pin Plastic Tqfp 35 EA P3.0/RXD 34 NC 33 ALE P3.1/TXD Pin Plastic QFJXTAL1 XTAL2 19 P3.7/RD 18 P3.6/WR MSM80C154S/83C154S¡ Semiconductor PIN DescriptionsALE XTAL1 ¡ SemiconductorMSM80C154S/83C154SXTAL2 Diagram of Special Function Registers RegistersSpecial Function Registers Timer mode register Tmod GateInterrupt signal Power control register PconCPU is reset Timer control register Tcon Interrupt request flag for external interruptTcon TR1 TF0 TR0 IE1 IT1 IE0 IT0REN Serial port control register SconMode Interrupt enable register IE Interrupt control bit for serial portReserved bit. The output data is 1 if the bit is read Overall interrupt control bitPriority is assigned when bit is Interrupt priority register IPPriority interrupt circuit control bit PCT PT2 PT1 PX1 PT0 PX0Bank When this bit is set to Control register IoconIZC Received at a serial portTimer 2 control register T2CON Memory Maps Program AreaHEX 0FF Addressingindirectregister BIT RAMBANK3 BANK2MSM80C154S/83C154S Diagram of Internal Data Memory RAM 0FFH2FH 0FHAbsolute Maximum Ratings Recommended Operating ConditionsDC Characteristics Electrical CharacteristicsPort 0, ALE, Psen Maximum power supply current normal operation ICC mA Maximum power supply current idle mode ICC mALogical 0 Input Current VI=0.1 Logical 1 Output Current Output High Voltage Port 1, 2VO=0.1 Port 1, 2 Logical 1 to 0 Transition 285 Input Measuring circuitsOutput ALE Signal Width Address Setup TimeFalling Edge Psen Signal Width To ALE Falling Edge Address Hold TimePORT0 External program memory read cycleInstr External data memory access AC characteristics External data memory read cycle External data memory write cycleSerial port I/O Extension Mode AC characteristics Parameter Symbol Min Max UnitALE Shift Clock Input DataAC Characteristics Measuring Conditions External Oscillator SignalXTAL1 external clock input waveform conditions External Clock Drive WaveformBasictiming TimingDiagram 294