Absolute Maximum Ratings

¡ SemiconductorMSM80C154S/83C154S

Parameter	Symbol	Condition	Rating	Unit

Supply voltage	VCC	Ta=25°C	–0.5 to 7	V
Input voltage	VI	Ta=25°C	–0.5 to VCC+0.5	V
Storage temperature	TSTG	—	–55 to +150	°C

RECOMMENDED OPERATING CONDITIONS

Parameter	Symbol	Condition	Range	Unit

Power supply voltage	VCC	See below	2.0 to 6.0	V
Memory retension voltage	VCC	fOSC=0 Hz (Oscillation stop)	2.0 to 6.0	V
Oxcillation frequency	fOSC	See below	1 to 24	MHz
External clock operating	fEXTCLK	See below	0 to 24	MHz
frequency

Ambient temperature	Ta	—	–40 to +85	°C

*1 Depends on the specifications for the oscillator or ceramic resonater.

	12				1
	5					(MHz)
	4				3
s)	3
(m	3					EXTCLK
(m
CY
t	2				6	f
	2				6	OSC
						OSC
						f
	1				12
	0.6				20
	0.5				24
	2 2.2	3	4	5	6

Power Supply Voltage (VCC)

281

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Oki MSM83C154S, MSM80C154S manual Absolute Maximum Ratings, Recommended Operating Conditions

Contents

Cmos 8-bit Microcontroller FeaturesGeneral Description ¡SemiconductorSemiconductor MSM80C154S/83C154S ¡ Semiconductor MSM80C154S/83C154S Address Decoder SignalTIMER/COUNTER 0 Interrupt 2PORT Psen PIN Configuration TOP ViewPin Plastic DIP 25 P2.7 24 P2.6 23 P2.5 P2.4 ResetPin Plastic QFP 44 P1.4 P1.5 P1.6 P1.7 Pin Plastic Tqfp XTAL1 XTAL2 19 P3.7/RD 18 P3.6/WR Pin Plastic QFJ35 EA P3.0/RXD 34 NC 33 ALE P3.1/TXD ALE PIN DescriptionsMSM80C154S/83C154S¡ Semiconductor XTAL2 ¡ SemiconductorMSM80C154S/83C154SXTAL1 Registers Diagram of Special Function Registers Gate Special Function Registers Timer mode register Tmod CPU is reset Power control register PconInterrupt signal TR1 TF0 TR0 IE1 IT1 IE0 IT0 Timer control register TconInterrupt request flag for external interrupt Tcon Mode Serial port control register SconREN Overall interrupt control bit Interrupt enable register IEInterrupt control bit for serial port Reserved bit. The output data is 1 if the bit is read PCT PT2 PT1 PX1 PT0 PX0 Priority is assigned when bit isInterrupt priority register IP Priority interrupt circuit control bit Bank Received at a serial port When this bit is set toControl register Iocon IZC Timer 2 control register T2CON Program Area Memory Maps BANK2 HEX 0FF AddressingindirectregisterBIT RAM BANK3 0FH MSM80C154S/83C154S Diagram of Internal Data Memory RAM0FFH 2FH Recommended Operating Conditions Absolute Maximum Ratings Port 0, ALE, Psen Electrical CharacteristicsDC Characteristics Maximum power supply current idle mode ICC mA Maximum power supply current normal operation ICC mA VO=0.1 Port 1, 2 Logical 1 to 0 Transition Output High Voltage Port 1, 2Logical 0 Input Current VI=0.1 Logical 1 Output Current 285 Output Measuring circuitsInput To ALE Falling Edge Address Hold Time ALE Signal WidthAddress Setup Time Falling Edge Psen Signal Width Instr External program memory read cyclePORT0 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 Clock Drive Waveform AC Characteristics Measuring ConditionsExternal Oscillator Signal XTAL1 external clock input waveform conditions 294 Basictiming TimingDiagram

¡ SemiconductorMSM80C154S/83C154S

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

Parameter

Symbol

Condition

Range

Unit