M38039G8HKP datasheet(48/92 Pages) RENESAS

48 / 92 page

Rev.1.10

Nov 14, 2005

Page 48 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

• 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. If the internal clock is used,

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

(address 001F16).

[Serial I/O2 Control Register (SIO2CON)] 001D16

The serial I/O2 control register contains eight bits which control

various serial I/O2 functions.

Fig 37. Structure of Serial I/O2 control register

Fig 38. Block diagram of serial I/O2

Serial I/O2 control register

(SIO2CON : address 001D16)

Internal synchronous clock selection bits

b2 b1 b0

00 0: f(XIN)/8 (f(XCIN)/8 in low-speed mode)

00 1: f(XIN)/16 (f(XCIN)/16 in low-speed mode)

01 0: f(XIN)/32 (f(XCIN)/32 in low-speed mode)

01 1: f(XIN)/64 (f(XCIN)/64 in low-speed mode)

11 0: f(XIN)/128 f(XCIN)/128 in low-speed mode)

11 1: f(XIN)/256 (f(XCIN)/256 in low-speed mode)

Serial I/O2 port selection bit

0: I/O port

1: SOUT2, SCLK2 signal output

SRDY2 output enable bit

0: I/O port

1: SRDY2 signal output

Transfer direction selection bit

0: LSB first

1: MSB first

Serial I/O2 synchronous clock selection bit

0: External clock

1: Internal clock

P51/SOUT2 P-channel output disable bit

0: CMOS output (in output mode)

1: N-channel open drain output (in output mode)

f(XIN)

Serial I/O counter 2 (3)

Serial I/O2 register (8)

Synchronization

circuit

“1”

“0”

“1”

“0”

“1”

“0”

“1”

1/8

1/16

1/32

1/64

1/128

1/256

Data bus

Serial I/O2

interrupt request

Serial I/O2 port selection bit

Serial I/O2 synchronous

clock selection bit

SRDY2 output enable bit

External clock

Internal synchronous

clock selection bits

P52/SCLK2

P51/SOUT2

P50/SIN2

P52 latch

P51 latch

P53 latch

P53/SRDY2

(f(XCIN) in low-speed mode)

SRDY2

Address 001F16

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