Renesas PROM Programming Adapter PCA7435FPG02 Manual de usuario descargar pdf (Pagina 38)

7540 Group

Rev.4.00 Jun 21, 2004 page 38 of 82

REJ03B0011-0400Z

●Serial I/O2

The serial I/O2 function can be used only for clock synchronous

serial I/O.

For clock synchronous serial I/O2 the transmitter and the receiver

must use the same clock. When the internal clock is used, transfer

is started by a write signal to the serial I/O2 register.

Note: Serial I/O2 can be used in the following cases;

(1) Serial I/O1 is not used,

(2) Serial I/O1 is used as UART and BRG output divided by 16 is

selected as the synchronized clock.

[Serial I/O2 control register] SIO2CON

The serial I/O2 control register contains 8 bits which control vari-

ous serial I/O functions.

• Set “0” to bit 3 to receive.

• At reception, clear bit 7 to “0” by writing a dummy data to the se-

rial I/O2 register after completion of shift.

Fig. 35 Structure of serial I/O2 control registers

Fig. 36 Block diagram of serial I/O2

Internal synchronous clock selection bits

000 : f(X

IN)/8

001 : f(X

IN)/16

010 : f(X

IN)/32

011 : f(X

IN)/64

110 : f(X

IN)/128

111 : f(X

IN)/256

b7 b0

Not used

(returns “0” when read)

Transfer direction selection bit

0 : LSB first

1 : MSB first

CLK2 pin selection bit

0 : External clock (S

CLK2 is an input)

1 : Internal clock (S

CLK2 is an output)

Transmit / receive shift completion flag

0 : shift in progress

1 : shift completed

Note : When using it as a SDATA input, set the port P13

 direction register to “0”.

Serial I/O2 control register

(SIO2CON: address 0030

16, initila value: 0016)

DATA2 pin selection bit (Note)

0 : I/O port / SDATA2 input

1 : S

DATA2 output

“1”

“0”

“1”

“0”

“1”

1/8

1/16

1/32

1/64

1/128

1/256

Data bus

Serial I/O2

interrupt request

DATA2

pin selection bit

Serial I/O counter 2 (3)

Serial I/O shift register 2 (8)

CLK2

pin selection bit

Internal synchronous

clock selection bits

Divider

CLK2

DATA2

latch

CLK2 pin

selection bit

CLK

latch

DATA2

pin selection bit

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 87 88

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