Oki MSM83C154S AC Characteristics Measuring Conditions, External Clock Drive Waveform, Test Point

Page 35

¡ Semiconductor

MSM80C154S/83C154S

(7)AC Characteristics Measuring Conditions

1.Input/output signal

VOH		VIH	VIH		VOH
		VIH	VIH
			TEST POINT
VOL		VIL	VIL		VOL
		VIL	VIL

*The input signals in AC test mode are either VOH (logic "1") or VOL (logic "0") input signals where logic "1" corresponds to a CPU output signal waveform measuring point in excess of VIH, and logic "0" to a point below VIL.

2.Floating

VOH

VOL

				Floating
			VIH	Floating	VIH


			VIL		VIL
			VIL		VIL

VOH

VOL

*The port 0 floating interval is measured from the time the port 0 pin voltage drops below VIH

after sinking to GND at 2.4 mA when switching to floating status from a "1" output, and from the time the port 0 pin voltage exceeds VIL after connecting to a 400 mA source when switching to floating status from a "0" output.

(8)XTAL1 external clock input waveform conditions

Parameter	Symbol	Min.	Max.	Unit

External Clock Freq.	1/tCLCL	0	24	MHz
Clock Pulse width 1	tCHCx	15	—	ns
Clock Pulse width 2	tCLCX	15	—	ns
Rise Time	tCLCH	—	5	ns
Fall Time	tCHCL	—	5	ns

External Clock Drive Waveform

EXTERNAL

OSCILLATOR

SIGNAL

tCHCX

tCHCL

tCLCX

0.7VCC

0.2VCC - 0.1

tCLCH

tCLCL

293

Image 35

Contents Cmos 8-bit Microcontroller FeaturesGeneral Description ¡SemiconductorSemiconductor MSM80C154S/83C154S¡ Semiconductor MSM80C154S/83C154SAddress Decoder SignalTIMER/COUNTER 0 Interrupt 2PORTPsen 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 P1.7Pin 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 RegistersGate Special Function Registers Timer mode register TmodCPU is reset Power control register PconInterrupt signal TR1 TF0 TR0 IE1 IT1 IE0 IT0 Timer control register TconInterrupt request flag for external interrupt TconMode 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 readPCT PT2 PT1 PX1 PT0 PX0 Priority is assigned when bit isInterrupt priority register IP Priority interrupt circuit control bitBank Received at a serial port When this bit is set toControl register Iocon IZCTimer 2 control register T2CON Program Area Memory MapsBANK2 HEX 0FF AddressingindirectregisterBIT RAM BANK30FH MSM80C154S/83C154S Diagram of Internal Data Memory RAM0FFH 2FHRecommended Operating Conditions Absolute Maximum RatingsPort 0, ALE, Psen Electrical CharacteristicsDC Characteristics Maximum power supply current idle mode ICC mA Maximum power supply current normal operation ICC mAVO=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 WidthInstr External program memory read cyclePORT0 External data memory access AC characteristics External data memory write cycle External data memory read cycleParameter Symbol Min Max Unit Serial port I/O Extension Mode AC characteristicsInput Data ALE Shift ClockExternal Clock Drive Waveform AC Characteristics Measuring ConditionsExternal Oscillator Signal XTAL1 external clock input waveform conditions294 Basictiming TimingDiagram