M32C83T datasheet(320/527 Pages) RENESAS

320 / 527 page

Page 297

21. Intelligent I/O (Group 0, 1 Communication Function)

)

(

Table 21.17 Registers to be Used and Settings

Bit

Function

GiBCR0

BCK1 to BCK0

Set to "112"

DIV4 to DIV0

Select divide ratio of count source

Set to "0"

GiBCR1

7 to 0

Set to "0001 00102"

GiPOCR0

7 to 0

Set to "0000 01112"

GiPOCR1

7 to 0

Set to "0000 01112"

GiPOCR3

7 to 0

Set to "0000 00102" (1)

GiPO0

15 to 0

Set the bit rate

= transfer clock frequency(1)

GiPO3

15 to 0

Set to a value smaller than the GiPO0 register(1)

GiFS

FSC3,1,0

Set to "0"

GiFE

IFE3,1,0

Set to "1"

GiERC

7 to 0

Set to "0010 00002"

GiMR

GMD1 to GMD0

Set to "012"

CKDIR

Select the internal clock or external clock

STPS

Set to "0"

UFORM

Select either LSB first or MSB first

IRS

Select how the transmit interrupt is generated

GiCR

Transmit buffer empty flag

TXEPT

Transmit register empty flag

Receive complete flag

Set to "1" to enable transmission and reception

Set to "1" to enable reception

IPOL

Select ISRxD input polarity (usually set to "0")

OPOL

Select ISTxD output polarity (usually set to "0")

GiTB

7 to 0

Write data to be transmitted

GiRB

15 to 0

Received data and error flag are stored

i = 0 to 1

NOTES:

1. The CKDIR bit in the GiMR register is set to "0" (internal clock)

Table 21.18 Pin Settings (1)

Port

Function

Bit and Setting

Name

PS1 Register PSL1 Register PSC Register PD7 Register IPS Register

P73

ISTxD1 output

PS1_3 = 1

PSL1_3 = 0

PSC_3 = 1

G1POCR0

P74

ISCLK1 input

PS1_4 = 0

PD7_4 = 0

IPS1 = 0

ISCLK1 output

PS1_4 = 1

PSL1_4 = 0

PSC_4 = 1

G1POCR1

P75

ISRxD1 input

PS1_5 = 0

PD7_5 = 0

IPS1 = 0

P76

ISTxD0 output

PS1_6 = 1

PSL1_6 = 0

PSC_6 = 0

G0POCR0

P77

ISCLK0 input

PS1_7 = 0

PD7_7 = 0

IPS0 = 0

ISCLK0 output

PS1_7 = 1

G0POCR1

NOTES:

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

function used).

Table 21.19 Pin Settings (2)

Port

Function

Bit and Setting

Name

PS2 Register PD8 Register

IPS register

P80

ISRxD0 input

PS2_0 = 0

PD8_0 = 0

IPS0 = 0

fBTi

2x(setting value + 2)

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