Zilog Z16C30 Manual do Utilizador descarregar pdf (Página 73)

5-6

Z16C30 USC

USER'S MANUAL

UM97USC0100

ZILOG

5.5 THE MODE REGISTERS (CMR, TMR AND RMR) (Continued)

Later sections describe each of these modes and proto-

cols individually, including the significance of the Tx and

RxSubMode bits (CMR15-12 and CMR7-4 respectively) in

each case. The various major modes use the SubMode

bits differently, to control protocol variations and options

that are specific to each mode. (Sometimes the same

SubMode option applies to two or more related major

modes.)

The TxMode field should be changed only while the

Transmitter is disabled in the TMR, as described in the next

section. Similarly, the RxMode field should be changed

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

TxSubMode TxRMode RxSubMode RxMode

Figure 5-4. The Channel Mode Register (CMR)

TxCRCType

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

TxEncode

TxCRC

Enab

TxCRC

Start

TxPar

Enab

TxCRC

atEnd

TxEnable

TxParType

TxLength

Figure 5-5. The Transmit Mode Register (TMR)

RxCRCType

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

RxDecode

RxCRC

Enab

RxCRC

Start

RxPar

Enab

QAbort

RxEnable

RxParType

RxLength

Figure 5-6. The Receive Mode Register (RMR)

only while the Receiver is disabled in the RMR. While it’s

possible to change the TxSubMode or RxSubMode fields

while the Transmitter or Receiver is operating, the options

provided by these fields are typically static in nature and

the need to change them should seldom arise.

The Transmit and Receive Mode Registers (TMR and

RMR) contain basic control information for the Transmitter

and Receiver, including the serial format and data-integ-

rity checking. Figures 5-5 and 5-6 show the TMR and RMR

respectively.

UM009402-0201

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