M32C83T datasheet(237/527 Pages) RENESAS

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Page 214

16. Serial I/O (Special Function)

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16.6 Special Mode 4 (IE Mode)

In IE mode, devices connected with the IEBus can communicate in UART mode.

Table 16.30 lists registers to be used and settings. Tables 16.30 to 16.32 list pin settings.

Table 16.30. Registers To Be Used and Settings in IE Mode

Bit

Function

UiTB

0 to 8

Set transmit data

UiRB

0 to 8

Received data can be read

OER, FER,

Error flags

PER, SUM

UiBRG

0 to 7

Set bit rate

UiMR

SMD2 to SMD0

Set to "1102"

CKDIR

Select the internal clock or external clock

STPS

Set to "0"

PRY

Disabled because PRYE=0

PRYE

Set to "0"

IOPOL

Select TxD and RxD I/O polarity

UiC0

CLK1 to CLK0

Select the count source for the UiBRG register

CRS

Disabled because CRD=1

TXEPT

Transfer register empty flag

CRD

Set to "1"

NCH

Select output format of the TxDi pin

CKPOL

Set to "0"

UFORM

Set to "0"

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, UiLCH,

Set to "0"

SCLKSTPB

UiSMR

0 to 3

Set to "00002"

ABSCS

Select bus conflict detect sampling timing

ACSE

Set to "1" to automatically clear the transmit enable bit

SSS

Select transmit start condition

SCLKDIV

Set to "0"

UiSMR2

0 to 7

Set to "0016"

UiSMR3

0 to 7

Set to "0016"

UiSMR4

0 to 7

Set to "0016"

IFSR

IFSR6, IFSR7

Select how the bus conflict interrupt occurs

i=0 to 4

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