Oki MSM80C154S, MSM83C154S manual External data memory read cycle, External data memory write cycle

Page 32

MSM80C154S/83C154S

¡ Semiconductor

(4) External data memory read cycle

ALE

PSEN

PORT 0	INSTR	A0 to A7
PORT 0	IN	PCL
	IN	PCL
PORT 2	PCH	A8 to A15 PCH

tLHLLtWHLH

tLLDV
tLLWL		tRLRH
tAVLL tLLAX	tRLDV	tRHDZ
tAVLL tLLAX		tRHDX

tAZRL
tAZRL

A0 to A7			DATA IN	A0 to A7
A0 to A7			DATA IN	A0 to A7
Rr or DPL				PCL
	tAVWL	tAVDV


	P2.0 to P2.7 DATA or		A8 to A15 DPH	A8 to A15 PCH

(5)External data memory write cycle

ALE

PSEN

PORT 0	INSTR	A0 to A7
PORT 0	IN	PCL
	IN	PCL
PORT 2	A8 to A15	A8 to A15 PCH
	PCH

tLHLLtWHLH

tLLWL	tWLWH
tLLAX	tQVWH
tAVLL	tQVWH	tWHQX
tQVWX		tWHQX

A0 to A7		DATA (ACC)
Rr or DPL		DATA (ACC)
Rr or DPL
	tAVWL

P2.0 to P2.7 DATA or A8 to A15 DPH

A0 to A7

PCL

A8 to A15 PCH

290

Image 32

Contents Features General Description¡SemiconductorSemiconductor MSM80C154S/83C154S Cmos 8-bit MicrocontrollerMSM80C154S/83C154S ¡ SemiconductorSignal TIMER/COUNTER 0 Interrupt2PORT Address DecoderPsen PIN Configuration TOP ViewPin Plastic DIP 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 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 Diagram of Special Function Registers RegistersSpecial Function Registers Timer mode register Tmod GateCPU is reset Power control register PconInterrupt signal Timer control register Tcon Interrupt request flag for external interruptTcon TR1 TF0 TR0 IE1 IT1 IE0 IT0Mode Serial port control register SconREN 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 ConditionsPort 0, ALE, Psen Electrical CharacteristicsDC Characteristics Maximum power supply current normal operation ICC mA Maximum power supply current idle mode 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 ALE Signal Width Address Setup Time Falling Edge Psen Signal Width To ALE Falling Edge Address Hold TimeInstr External program memory read cyclePORT0 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

MSM80C154S/83C154S

¡ Semiconductor

(4) External data memory read cycle

PSEN

(5)External data memory write cycle

PSEN

INSTR