¡ SemiconductorMSM80C154S/83C154S, XTAL1, XTAL2

¡ SemiconductorMSM80C154S/83C154S

PIN Descriptions (Continued)

Symbol	Descriptipn

RESET	If this pin remains "H" for at least one machine cycle, the MSM80C154S/MSM83C154S is reset.
	Since this pin is pulled down internally, a power-on reset is achieved by simply connecting a
	capacitor between VCC and this pin.

XTAL1	Oscillator inverter input pin. External clock is input through XTAL1 pin.

XTAL2	Oscillator inverter output pin.

VCC	Power supply pin during both normal operation and standby operations.
VSS	GND pin.

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Image 9

Oki MSM83C154S manual ¡ SemiconductorMSM80C154S/83C154S, XTAL1, XTAL2

Contents

General Description Features¡SemiconductorSemiconductor MSM80C154S/83C154S Cmos 8-bit Microcontroller ¡ Semiconductor MSM80C154S/83C154S TIMER/COUNTER 0 Interrupt Signal2PORT Address Decoder PIN Configuration TOP View Pin Plastic DIPPsen Pin Plastic QFP Reset44 P1.4 P1.5 P1.6 P1.7 25 P2.7 24 P2.6 23 P2.5 P2.4 Pin Plastic Tqfp Pin Plastic QFJ 35 EA P3.0/RXD 34 NC 33 ALE P3.1/TXDXTAL1 XTAL2 19 P3.7/RD 18 P3.6/WR PIN Descriptions MSM80C154S/83C154S¡ SemiconductorALE ¡ SemiconductorMSM80C154S/83C154S XTAL1XTAL2 Registers Diagram of Special Function Registers Gate Special Function Registers Timer mode register Tmod Power control register Pcon Interrupt signalCPU is reset Interrupt request flag for external interrupt Timer control register TconTcon TR1 TF0 TR0 IE1 IT1 IE0 IT0 Serial port control register Scon RENMode Interrupt control bit for serial port Interrupt enable register IEReserved bit. The output data is 1 if the bit is read Overall interrupt control bit Interrupt priority register IP Priority is assigned when bit isPriority interrupt circuit control bit PCT PT2 PT1 PX1 PT0 PX0 Bank Control register Iocon When this bit is set toIZC Received at a serial port Timer 2 control register T2CON Program Area Memory Maps BIT RAM HEX 0FF AddressingindirectregisterBANK3 BANK2 0FFH MSM80C154S/83C154S Diagram of Internal Data Memory RAM2FH 0FH Recommended Operating Conditions Absolute Maximum Ratings Electrical Characteristics DC CharacteristicsPort 0, ALE, Psen Maximum power supply current idle mode ICC mA Maximum power supply current normal operation ICC mA Output High Voltage Port 1, 2 Logical 0 Input Current VI=0.1 Logical 1 Output CurrentVO=0.1 Port 1, 2 Logical 1 to 0 Transition 285 Measuring circuits InputOutput Address Setup Time ALE Signal WidthFalling Edge Psen Signal Width To ALE Falling Edge Address Hold Time External program memory read cycle PORT0Instr External data memory access AC characteristics External data memory write cycle External data memory read cycle Parameter Symbol Min Max Unit Serial port I/O Extension Mode AC characteristics Input Data ALE Shift Clock External Oscillator Signal AC Characteristics Measuring ConditionsXTAL1 external clock input waveform conditions External Clock Drive Waveform 294 Basictiming TimingDiagram

¡ SemiconductorMSM80C154S/83C154S

PIN Descriptions (Continued)

Symbol

RESET

XTAL1

XTAL2