AT89C5122DS-RDRUM datasheet(197/208 Pages) ATMEL

197 / 208 page

197

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Float Waveforms

For timing purposes as port pin is no longer floating when a 100 mV change from load

voltage occurs and begins to float when a 100 mV change from the loaded VOH/VOL level

occurs. IOL/IOH ≥ ± 20 mA.

Clock Waveforms

Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2.

FLOAT

VOH - 0.1 V

VOL + 0.1 V

VLOAD

VLOAD + 0.1 V

VLOAD - 0.1 V

DATA

PCL OUT

DATA

PCL OUT

DATA

PCL OUT

SAMPLED

STATE4

STATE5

STATE6

STATE1

STATE2

STATE3

STATE4

STATE5

FLOAT

THESE SIGNALS ARE NOT ACTIVATED DURING THE

EXECUTION OF A MOVX INSTRUCTION

INDICATES ADDRESS TRANSITIONS

EXTERNAL PROGRAM MEMORY FETCH

FLOAT

DATA

SAMPLED

DPL OR Rt OUT

INDICATES DPH OR P2 SFR TO PCH TRANSITION

PCL OUT (IF PROGRAM

MEMORY IS EXTERNAL)

PCL OUT (EVEN IF PROGRAM

MEMORY IS INTERNAL)

PCL OUT (IF PROGRAM

MEMORY IS EXTERNAL

OLD DATA NEW DATA

P0 PINS SAMPLED

P1, P2, P3 PINS SAMPLED

P0 PINS SAMPLED

RXD SAMPLED

INTERNAL

CLOCK

XTAL2

ALE

PSEN

P2 (EXT)

READ CYCLE

WRITE CYCLE

PORT OPERATION

MOV PORT SRC

MOV DEST P0

MOV DEST PORT (P1. P2. P3)

(INCLUDES INTO. INT1. TO T1)

SERIAL PORT SHIFT CLOCK

TXD (MODE 0)

DATA OUT

DPL OR Rt OUT

INDICATES DPH OR P2 SFR TO PCH TRANSITION

RXD SAMPLED

AT89C5122DS-RDRUM 데이터시트(PDF) 197 Page - ATMEL Corporation

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