M32C83T datasheet(344/527 Pages) RENESAS

344 / 527 page

Page 321

21. Intelligent I/O (Group 3 Communication Function)

)

(

Table 21.42 Registers to be Used and Settings

Bit

Function

G3BCR0

BCK1 to BCK0

Set to "112"

DIV4 to DIV0

Select divide ratio of count source

Set to "0"

G3BCR1

7 to 0

Set to "0001 00102"

G3POCR0

7 to 0

Set to "0000 01112"

G3POCR1

7 to 0

Set to "0000 01112"

G3POCR2

7 to 0

Set to "0000 00102"

G3PO0

15 to 0

Set bit rate

= transfer clock frequency

G3PO2

15 to 0

Set to a value smaller than the G3PO0 register

G3FE

7 to 0

Set to "0000 01112"

G3MR

GMD1 to GMD0 Set to "012"

CKDIR

Select the internal clock or external clock

TLD

Select transfer data length

UFORM

Select either LSB first or MSB first

IRS

Select how the transmit interrupt is generated

G3CR

Set to "1" to enable transmission

TXEPT

Transmit register empty flag

Transmit buffer empty flag

Set to "1" to enable reception

Receive complete flag

OPOL

ISTxD3 output polarity inverse (usually set to "0")

IPOL

ISRxD3 input polarity inverse

G3TB

15 to 0

Write transmit data

G3RB

15 to 0

Received data is stored

Table 21.43 Pin Setting in Clock Synchronous Serial I/O Mode (Group 3)

Port

Function

Bit and Setting

Name

PS2 Register

PSL2 Register

PD8 Register IPS Register

P81

ISTxD3 output

PS2_1 = 1

PSL2_1 = 1

G3POCR0

P82

ISRxD3 input

PS2_2 = 0

PD8_2 = 0

IPS7 = 0

NOTES:

1. Set the MOD2 to MOD0 bits in the corresponding register to "1112" (output of the communication

function used).

Table 21.44 Pin Setting (Continued)

Port

Function

Bit and Setting

Name

PS6 Register

PD12 Register

IPS Register

P120

ISTxD3 output

PS6_0 =1

G3POCR0

P121

ISCLK3 input

PS6_1 = 0

PD12_1 = 0

ISCLK3 output

PS6_1 = 1

G3POCR1

P122

ISRxD3 input

PS6_2 = 0

PD12_2 = 0

IPS7 = 1

NOTES:

1. Set the MOD2 to MOD0 bits in the corresponding register to "1112" (output of the communication

function used).

fBT3

2 x (setting value + 2)

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