M16CSLASH1N datasheet(126/238 Pages) RENESAS

126 / 238 page

Rev.1.00

Oct 20, 2004

page 114 of 222

M16C/1N Group

13. Serial I/O

REJ09B0007-0100Z

b5 b4

UARTi transmit/receive mode registers

SMD0

Serial I/O mode select bit

Invalid in clock synchronous serial I/O mode

0 : Internal clock

1 : External clock (Note 1)

Set to "0"

Internal/external clock

select bit

SMD1

SMD2

STPS

PRY

PRYE

Reserved bit

CKDIR

Symbol

UiMR (i=0,1)

Address

00A016, 00A816

When reset

0016

Function

Bit name

Bit symbol

Note 1: Set the corresponding port direction register to "0".

b2 b1 b0

0 0 1 : Clock synchronous serial

I/O mode

Function

Pin name

Method of selection

Remarks

Serial data output

Serial data input

Transfer clock output

Transfer clock input

TxD0 (P14)

TxD1 (P37)

RxD0 (P15)

RxD1 (P35)

RxD1 (P37)

CLKi (P16, P36)

RxD1 input pin select bit

(bit 6 at address 00B016)="1"

Port P15 direction register

(bit 5 at address 00E316)="0"

Port P35 direction register

(bit 5 at address 00E716)="0"

RxD1 input pin select bit

(bit 6 at address 00B016)="1"

Port P37 direction register

(bit 7 at address 00E716)="0"

RxD1 input pin select bit

(bit 6 at address 00B016)="0"

Internal/external clock select bit

(bit 3 at addresses 00A016 and

00A816)="0"

Internal/external clock select bit

(bit 3 at address 00A016 and

00A816)="1"

Ports P16 and P36 direction

and 00E716)="0"

Port P14 cannot be used as an I/O port even when

performing only serial data input but not serial data output.

Port P37 cannot be used as an I/O port even when

performing only serial data input but not serial data output.

Port P15 can be used as an I/O port when performing only

serial data output but not serial data input.

Port P35 can be used as an I/O port when performing only

serial data output but not serial data input.

When setting Port P37 as RxD1, serial data output cannot

be performed.

Port P35 can be used as an I/O port.

Table 13.2 Input/output pin functions in clock synchronous serial I/O mode

Figure 13.6 UARTi transmit/receive mode register in clock synchronous serial I/O mode

Table 13.2 lists the functions of the input/output pins during clock synchronous serial I/O mode. This table

shows the pin functions when the transfer clock output from multiple pins is not selected. Note that for a

period from when the UARTi operation mode is selected to when transfer starts, the TxDi pin outputs an

"H". (If the N-channel open-drain is selected, this pin is in floating state.)

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