UT82CRH51AC-68WCC Ver la hoja de datos (PDF) - Aeroflex UTMC

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UT82CRH51AC-68WCC

UT82CRH51A USART

Aeroflex UTMC 

D7 D6 D5 D4 D3 D2 D1 D0

SCS ES EP PE L2 L1 0 0

D

N

CHARACTER LENGTH

0

10 1

0

01 1

5

6 78

BIT BITS BITS BITS

PARITY ENABLE

1 = ENABLE

0 = DISABLE

EVEN PARITY

GENERATION/CHECK

1 = EVEN 0= ODD

EXTERNAL SYNC DETECT

1 = SYNDET IS AN INPUT

0 = SYNDET IS AN OUTPUT

SINGLE CHARACTER SYNC

1 = SYNGLE SYNC

CHARACTER

0 = DOUBLE SYNC

CHARACTER

Figure 12. Mode Instruction Format, Synchronous Mode

CPU BYTE (5-8 BITS/CHAR)

DATA CHARACTER

ASSEMBLED SERIAL DATA OUTPUT

(TxD)

SYNC SYNC

CHAR 1 CHAR 2

DATA CHARACTER

RECEIVE FORMAT

ASSEMBLED SERIAL DATA OUTPUT

(RxD)

SYNC

SYNC

CHAR 1 CHAR 2

DATA CHARACTER

CPU BYTE (5-8 BITS/CHAR)

DATA CHARACTER

Figure 13. Data Format, Synchronous Mode

3.0 COMMAND INSTRUCTION DEFINITION

Once the functional definition of the UT82CRH51A has been

programmed by the Mode Instruction and the sync characters

are loaded (if in Sync Mode) then the device is ready to be used

for data communication. The Command Instruction controls the

actual operation of the selected format. Functions such as En-

able Transmit/Receive, Error Reset and Modem Controls are

provided by the Command Instruction.

Once the Mode Instruction has been written into the

UT82CRH51A and the Sync characters inserted, if necessary,

then all further "control write" (C/D = 1) will load a Command

Instruction. A Reset Operation (internal or external) returns the

UT82CRH51A to the Mode Instruction format. Note: Internal

Reset on Power-Up

When power is first applied, the UT82CRH51A may come up in

the Mode, Sync character or Command format. To guarantee

that the device is in the Command Instruction format before the

Reset command is issued, it is safest to execute the worst-case

initialization sequence (sync mode with two sync characters).

Loading three 00Hs consecutively into the device with C/D = 1

configures sync operation and writes two dummy 00H sync

characters. An Internal Reset command (40H) may then be is-

sued to return the device to the "Idle" state (figure 14).

D7 D6 D5 D4 D3 D2 D1 D0

EH IR RTS ER SBR RxE DT TxE

TRANSMIT ENABLE

1 = enable

0 = disable

DATA TERMINAL

READY

"high" will force DTR out-

put to zero

RECEIVE ENABLE

1 = enable

0 = disable

SEND BREAK CHARACTER

1 = forces TxD "low"

0 = normal operation

ERROR RESET

1 = reset error flags PE, OE, FE

REQUEST TO SEND

"high" will for RTS output to zero

INTERNAL RESET

"high" returns UT82CRH51A to

Mode Instruction Format

ENTER HUNT MODE

1 = enable search for Sync

Characters

Note: Error Reset must be performed whenever RxEnable

and Enter Hunt are programmed.

Figure 14. Mode Instruction Format,

Synchronous Mode

9

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