M16C30L Datasheet, PDF(124/166 Page) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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M16C30L Datasheet, PDF (124/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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UART2 Special Mode Register

Mitsubishi microcomputers

M16C / 30L Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

P70 through P72 conforming to the simplified I 2C bus

P70/TxD2/SDA

P71/RxD2/SCL

P72/CLK2

Timer

I/O

Selector

UART2

SDDS=0

or DL=000

Digital delay

(Divider)

SDDS=1 and

DL 000

UART2

Transmission

IICM=0

or IICM2=1

IICM=1

and IICM2=0

SDHI

ALS

UART2 transmission/

NACK interrupt request

Noize

Filter

Noize

Filter

Noize

Filter

Arbitration

Timer

IICM=1

Reception register

IICM=0

or IICM2=1

UART2 reception/ACK interrupt

request

IICM=0

Start condition

detection

Stop condition

UART2

Bus busy

IICM=1

and IICM2=0

detection

Falling edge

detection

L-synchronous

output enabling

bit

I/O

Data bus

Selector (Port P71 output data latch)

UART2

Internal clock

IICM=1

SWC2

External clock

NACK

ACK

9th pulse

IICM=1

CLK

control

Bus collision

detection

UART2

IICM=0

Bus collision/start, stop condition

detection interrupt request

IICM=0

Falling edge of 9 bit

SWC

UART2

IICM=0

Selector

I/O

Timer

Port reading

* With IICM set to 1, the port terminal is to be readable

even if 1 is assigned to P71 of the direction register.

To DMA0

Figure 1.16.27. Functional block diagram for I2C mode

Table 1.16.9. Features in I2C mode

Function

Normal mode

1 Factor of interrupt number 10 (Note 2)

Bus collision detection

2 Factor of interrupt number 15 (Note 2)

UART2 transmission

3 Factor of interrupt number 16 (Note 2)

UART2 reception

4 UART2 transmission output delay

Not delayed

5 P70 at the time when UART2 is in use

TxD2 (output)

6 P71 at the time when UART2 is in use

RxD2 (input)

7 P72 at the time when UART2 is in use

CLK2

8 Noise filter width

9 Reading P71

15ns

Reading the terminal when 0 is

assigned to the direction register

10 Initial value of UART2 output

H level (when 0 is assigned to

the CLK polarity select bit)

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.

I2C mode (Note 1)

Start condition detection or stop

condition detection

No acknowledgment detection (NACK)

Acknowledgment detection (ACK)

Delayed (digital delay)

SDA (input/output) (Note 3)

SCL (input/output)

P72

200ns

Reading the terminal regardless of the

value of the direction register

The value set in latch P70 when the port is

selected

123

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