Analog-devices ADuC812 User Manual download pdf (Page 50)

REV. B

ADuC812

–50–

12 MHz Variable Clock

Parameter Min Typ Max Min Typ Max Unit Figure

UART TIMING (Shift Register Mode)

t

XLXL

Serial Port Clock Cycle Time 1.0 12t

CK

µs55

t

QVXH

Output Data Setup to Clock 700 10t

CK

– 133 ns 55

t

DVXH

Input Data Setup to Clock 300 2t

CK

+ 133 ns 55

t

XHDX

Input Data Hold after Clock 0 0 ns 55

t

XHQX

Output Data Hold after Clock 50 2t

CK

– 117 ns 55

ALE (O)

TxD

(OUTPUT CLOCK)

RxD

(OUTPUT DATA)

RxD

(INPUT DATA)

t

XLXL

t

QVXH

t

XHQX

t

DVXH

t

XHDX

SET RI

OR

SET TI

0

6

MSB BIT6 BIT1

MSB BIT6 BIT1 LSB

7

LSB

1

Figure 54. UART Timing in Shift Register Mode

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 56

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