M16CSLASH26 datasheet(147/239 Pages) RENESAS

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UART2 Special Mode Register

141

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

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 1101 is assigned to

UART2 reception

Acknowledgment detection (ACK)

Noise filter width

15ns

200ns

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, 4)

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 P

when the

port is selected (Note 3)

the DMA request factor selection bits

Table 1.15.13. Features in I2C mode

Table 1.15.13 shows the relation between the I2C mode select bit and respective control workings.

Since this function uses clock-synchronous serial I/O mode, set this bit to “0” in UART mode.

UART2 Special Mode Register

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

Bit 0 of the UART2 special mode register are used as the I2C mode select bit.

Setting “1” in the I2C mode select bit (bit 0) goes the circuit to achieve the I2C bus (simplified I2C bus)

interface effective.

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