M32C83T datasheet(212/527 Pages) RENESAS

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Page 189

16. Serial I/O (UART)

)

(

Table 16.7 lists registers to be used and settings. Tables 16.8 to 16.10 list pin settings. When UARTi (i=0

to 4) operation mode is selected, the TxDi pin outputs an "H" signal before transfer is started (the TxDi pin

is in a high-impedance state when the N-channel open drain output is selected). Figure 16.14 shows an

example of a transmit operation in UART mode. Figure 16.15 shows an example of a receive operation in

UART mode.

Table 16.7 Registers to be Used and Settings in UART

Bit

Function

UiTB

0 to 8

Set transmit data(1)

UiRB

0 to 8

Received data can be read(1)

OER, FER,

Error flags

PER, SUM

UiBRG

0 to 7

Set bit rate

UiMR

SMD2 to SMD0

Set to "1002" when transfer data is 7 bits long

Set to "1012" when transfer data is 8 bits long

Set to "1102" when transfer data is 9 bits long

CKDIR

Select the internal clock or external clock

STPS

Select stop bit length

PRY, PRYE

Select parity enable or disable, odd or even

IOPOL

Select TxD / RxD I/O polarity

UiC0

CLK0, CLK1

Select count source for the UiBRG register

CRS

_______

Select either CTS or RTS when using either

TXEPT

Transfer register empty flag

CRD

________

_______

Enables or disables the CTS or RTS function

NCH

Select output format of the TxDi pin

CKPOL

Set to "0"

UFORM

Select the LSB first or MSB first when a transfer data is 8 bits long

Set to "0" when transfer data is 7 bits or 9 bits long

UiC1

Set to "1" to enable data transmission

Transfer buffer empty flag

Set to "1" to enable data reception

Reception complete flag

UiIRS

Select how the UARTi transmit interrupt is generated

UiRRM

Set to "0"

UiLCH

Select whether or not data logic is inversed when transfer data length is 7 or

8 bits. Set to "0" when transfer data length is 9 bits.

UiERE

Set to either "0" or "1"

UiSMR

0 to 7

Set to "0016"

UiSMR2

0 to 7

Set to "0016"

UiSMR3

0 to 7

Set to "0016"

UiSMR4

0 to 7

Set to "0016"

NOTES:

1. Use bits 0 to 6 when transfer data is 7 bits long, bits 0 to 7 when 8 bits long, bits 0 to 8 when 9 bits long.

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