M16CSLASH62 datasheet(156/621 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

UART2 Special Mode Register

141

UART2 Special Mode Register

The UART2 special mode register (address 037716) is used to control UART2 in various ways.

Figure 1.19.26 shows the UART2 special mode register.

UART2 special mode register

Symbol

Address

When reset

U2SMR

037716

0016

b6 b5

Bit name

Bit

symbol

Function

(During UART mode)

Function

(During clock synchronous

serial I/O mode)

ABSCS

ACSE

SSS

I C mode selection bit

Bus busy flag

0 : STOP condition detected

1 : START condition detected

SCLL sync output

enable bit

Bus collision detect

sampling clock select bit

Arbitration lost detecting

flag control bit

0 : Normal mode

1 : I C mode

0 : Update per bit

1 : Update per byte

IICM

ABC

BBS

LSYN

0 : Ordinary

1 : Falling edge of RxD2

0 : Disabled

1 : Enabled

Transmit start condition

select bit

Must always be “0”

0 : Rising edge of transfer

clock

1 : Underflow signal of timer A0

Auto clear function

select bit of transmit

enable bit

0 : No auto clear function

1 : Auto clear at occurrence of

bus collision

Must always be “0”

Note: Nothing but "0" may be written.

(Note)

Reserved bit

Always set to “0”

Figure 1.19.26. UART2 special mode register

Function

Normal mode

I2C mode (Note 1)

Factor of interrupt number 15 (Note 2)

UART2 transmission

No acknowledgment detection (NACK)

Factor of interrupt number 16 (Note 2)

UART2 reception

Start condition detection or stop

condition detection

UART2 transmission output delay

Not delayed

Delayed

P70 at the time when UART2 is in use

TxD2 (output)

SDA (input/output) (Note 3)

P71 at the time when UART2 is in use

RxD2 (input)

SCL (input/output)

P72 at the time when UART2 is in use

CLK2

P72

DMA1 factor at the time when 1 1 0 1 is assigned

to the DMA request factor selection bits

UART2 reception

Acknowledgment detection (ACK)

Noise filter width

15ns

50ns

Reading P71

Reading the terminal when 0 is

assigned to the direction register

Reading the terminal regardless of the

value of the direction register

Note 1: Make the settings given below when I2C mode is in use.

Set 0 1 0 in bits 2, 1, 0 of the UART2 transmission/reception mode register.

Disable the RTS/CTS function. Choose the MSB First function.

Note 2: Follow the steps given below to switch from a factor to another.

1. Disable the interrupt of the corresponding number.

2. Switch from a factor to another.

3. Reset the interrupt request flag of the corresponding number.

4. Set an interrupt level of the corresponding number.

Note 3: Set an initial value of SDA transmission output when serial I/O is invalid.

Factor of interrupt number 10 (Note 2)

Bus collision detection

Acknowledgment detection (ACK)

Initial value of UART2 output

H level (when 0 is assigned to

the CLK polarity select bit)

The value set in latch P70 when the port is

selected

Table 1.19.9. Features in I2C mode

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