Renesas M16C User Manual

Rev.1.10    Jul 01, 2005    page 132 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

14. Serial I/O

This document is under development and its contents are subject to change.

Nothing is assigned  When write, set to "0".
When read, their contents are indeterminate.

-

(b15-b9)

-

(b8-b0)

b7

b0

b0

b7

Function

UARTi Transmit Buffer Register (i = 0 to 2) 

(1)

Bit

Symbol

Symbol

Address

After Reset

U0TB

03A3h to 03A2h

 

Indeterminate

U1TB

03ABh to 03AAh

 

Indeterminate

U2TB

01FBh to 01FAh

 

Indeterminate

RW

Transmit data

WO

-

NOTE:

1. Use the MOV instruction to write to this register.

(b15)

(b8)

-

(b7-b0)

Assuming that set value = n, UiBRG 
divides the count source by n + 1

00h to FFh

WO

b7

b0

Function

Setting Range

UARTi Bit Rate Generator Register (i = 0 to 2) 

(1) (2)

Bit

Symbol

Symbol

Address

After Reset

U0BRG

03A1h

 

Indeterminate

U1BRG

03A9h

 

Indeterminate

U2BRG

01F9h

 

Indeterminate

RW

NOTES:

1. Write to this register while serial I/O is neither transmitting nor receiving. 
2. Use the MOV instruction to write to this register.

Nothing is assigned  When write, set to "0".
When read, their contents are "0".

-

(b10-b9)

-

(b7-b0)

-

(b8)

b7

b0

(b15)

(b8)

b7

b0

Function

UARTi Receive Buffer Register (i = 0 to 2)

Bit Name

Bit

Symbol

Symbol

Address

After Reset

U0RB

03A7h to 03A6h

 

Indeterminate

U1RB

03AFh to 03AEh

 

Indeterminate

U2RB

01FFh to 01FEh

 

Indeterminate

RW

-

-

ABT

Arbitration Lost
Detecting Flag 

(1)

Receive data (

D7 to D0)

Receive data (

D8)

0 : Not detected
1 : Detected

RO

RO

-

RW

Error Sum Flag 

(2)

SUM

0 : No error
1 : Error found

RO

Parity Error Flag 

(2)

PER

0 : No parity error
1 : Parity error found

RO

Framing Error Flag 

(2)

FER

0 : No framing error
1 : Framing error found

RO

Overrun Error Flag 

(2)

OER

0 : No overrun error
1 : Overrun error found

RO

NOTES:

1. The ABT bit is set to "0" by writing "0" in a program. (Writing "1" has no effect.)
2. When the SMD2 to SMD0 bits in the UiMR register = 000b (serial I/O disabled) or the RE bit in the UiC1 register = 0 

(reception disabled), all of the SUM, PER, FER and OER bits are set to "0" (no error). The SUM bit is set to "0" (no error)
when all of the PER, FER and OER bits are = 0 (no error).
Also, the PER and FER bits are set to "0" by reading the lower byte of the UiRB register.