Rainbow-electronics AT89C5122 Bedienungsanleitung PDF herunterladen (Seite 199)

199

AT8xC5122/23

4202E–SCR–06/06

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 V

level

occurs. I

≥ ± 20 mA.

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

FLOAT

- 0.1 V

+ 0.1 V

LOAD

+ 0.1 V

LOAD

- 0.1 V

DATA PCL OUT DATA PCL OUT DATA PCL OUT

SAMPLED SAMPLED SAMPLED

STATE4 STATE5 STATE6 STATE1 STATE2 STATE3 STATE4 STATE5

P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2

FLOAT FLOAT 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 PROGRA

MEMORY IS EXTERNA

OLD DATA

NEW DATA

P0 PINS SAMPLED

P1, P2, P3 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

1 2 ... 194 195 196 197 198 199 200 201 202 203 204 ... 212 213

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