M16CSLASH62M datasheet(167/615 Pages) RENESAS

167 / 615 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

S I/O3, 4

1-148

Functions for setting an SOUTi initial value

When using an external clock for the transfer clock, the SOUTi pin output level during a non-transfer

time can be set to the high or the low state. Figure 1.16.33 shows the timing chart for setting an SOUTi

initial value and how to set it.

Figure 1.16.33. Timing chart for setting SOUTi’s initial value and how to set it

S I/Oi operation timing

Figure 1.16.34 shows the S I/Oi operation timing

(i= 3, 4)

Hiz

(i= 3, 4)

1.5 cycle (max)

SI/Oi internal clock

Transfer clock

(Note 1)

Signal written to the S I/Oi

transmit/receive register

S I/Oi output SOUTi

S I/Oi input SINi

SI/Oi interrupt request

bit

Note2

Note 1: With the internal clock selected for the transfer clock, the frequency dividing ratio can be selected using bits 0 and 1 of the S I/Oi control

Note 2: With the internal clock selected for the transfer clock, the SOUTi (i = 3, 4) pin becomes to the high-impedance state after the transfer finishes.

Note 3: Shown above is the case where the SOUTi (i = 3, 4) port select bit =“1”.

"H"

"L"

"H"

"L"

"H"

"L"

"H"

"L"

"H"

"L"

"1"

"0"

Figure 1.16.34. S I/Oi operation timing chart

S I/Oi port select bit SMi3 = 0

SOUTi initial value select bit

SMi7 = 1

(SOUTi: Internal

“H” level)

S I/Oi port select bit

SMi3 = 0

(Port select: Normal port

SOUTi)

SOUTi terminal = “H” output

Signal written to the S I/Oi register

=“L”

“H”

“L”

(Falling edge)

SOUTi terminal = Outputting

stored data in the S I/Oi transmission/

reception register

Signal written to the S I/Oi

transmit/receive register

SOUTi (internal)

SOUTi's initial value

set bit (SMi7)

SOUTi terminal output

S I/Oi port select bit

(SMi3)

Setting the SOUTi

initial value to H

Port selection

(normal port

SOUTi)

(i = 3, 4)

Initial value = “H” (Note)

Port output

(Example) With “H” selected for SOUTi:

Note: The set value is output only when the external clock has been selected. When

initializing SOUTi, make sure the CLKi pin input is held “H” level.

If the internal clock has been selected or if SOUT output disable has been set,

this output goes to the high-impedance state.

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