M16CSLASH29 datasheet(242/499 Pages) RENESAS

242 / 499 page

14. Serial I/O

page 218

Figure 14.36 S3C and S4C Registers, S3BRG and S4BRG Registers, and S3TRR and S4TRR Registers

Symbol

Address

After Reset

S3BRG

036316

Undefined

S4BRG

036716

Undefined

0016 to FF16

Symbol

Address

After Reset

S3TRR

036016

Undefined

S4TRR

036416

Undefined

SymbolAddressAfter Reset

S3C036216

010000002

S4C036616

010000002

b7b6b5b4b3b2b1b0

Function

SMi5

SMi1

SMi0

SMi3

SMi6

SMi7

Internal synchronous clock

select bit

Transfer direction select bit

S I/Oi port select bit

SOUTi initial value set bit

0 0 : Selecting f1 or f2

0 1 : Selecting f8

1 0 : Selecting f32

1 1 : Do not set

b1 b0

0 : External clock (2)

1 : Internal clock (3)

Effective when the SMi3 is set to 0

0 : “L” output

1 : “H” output

0 : Input/output port

1 : SOUTi output, CLKi function

Bit Name

Bit

Symbol

Synchronous clock select bit

0 : LSB first

1 : MSB first

SMi2SOUTi output disable bit0 : SOUTi output

1 : SOUTi output disable(high impedance)

SMi4CLK polarity selct bit

0 : Transmit data is output at falling edge of

transfer clock and receive data is input at

rising edge

1 : Transmit data is output at rising edge of

transfer clock and receive data is input at

falling edge

(4)

(5)

NOTES:

1. Set the S4C register by the next instruction after setting the PRC2 bit in the PRCR register to 1 (write enable).

2. Set the SMi3 bit to 1 and the corresponding port direction bit to 0 (input mode).

3. Set the SMi3 bit to 1 (SOUTi output, CLKi function) .

4. When the SMi2 bit is set to 1, the corresponding pin goes to high-impedance regardless of the function in use.

5. When the SMi1 and SMi0 bit settings are changed, set the SiBRG register .

NOTES:

1. Write to this register while serial I/O is neither transmitting or receiving.

2. To receive data, set the corresponding port direction bit for SINi to 0 (input mode).

NOTES:

1. Write to this register while serial I/O is neither transmitting or receiving.

2. Use MOV instruction to write to this register.

3. Set the SiBRG register after setting bits SMi1 and SMi0 in the SiC register.

Transmission/reception starts by writing transmit data to this register. After

transmission/reception completion, reception data can be read by reading this register.

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