3819 datasheet(43/218 Pages) RENESAS

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3819 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

(2.3) When Selecting the Internal Clock

When selecting the internal clock, the P67/SRDY1/CS/SCLK12 pin

can be used as the SRDY1 pin by setting SC14 to “1”.

When selecting the internal clock, the P67 pin can be used as the

synchronous clock output pin SCLK12 by setting SIOAC3 to “1”. In

this case, the SCLK11 pin goes to high impedance state.

Select the function of the P67/SRDY1/CS/SCLK12 and P66/SCLK11

with the following registers (refer to Table 2):

qthe bit 3 (SC13), the bit 4(SC14), and the bit 6(SC16) of the se-

rial I/O1 control register

qthe bit 3 (SIOAC3) of the serial I/O automatic transfer control

When using both the SCLK11 and SCKL12 by switching, switch the

P67/SRDY1/CS/SCLK12 to the P67 (SC14=0) and set the P67 direc-

tion register to input mode. Note that switch SIOAC3 during “H” of

transfer clock at the completion of automatic transfer.

Table 2. SCLK11 and SCLK12 selection

SC16

SC14

SC33

SIOAC3

P66/SCLK11

SCLK11

High

impedance

P67/SCLK12

P67

SCLK12

Note : SC13: Serial I/O1 port selection bit

SC14: SRDY1 output selection bit

SC16: Synchronous clock selection bit

SIOAC3: Synchronous clock output pin selection bit

Fig. 20 Timing diagram during serial I/O automatic transfer (internal clock selected, SRDY used)

Fig. 21 Timing during serial I/O automatic transfer (internal clock selected, SCLK11 and SCLK12 used)

DI6

DI0

DO0

DO7

Bit 1 write signal of serial I/O

automatic transfer control

Serial I/O output

Sout

Serial I/O input

SIN

DI0

Transfer interval

Bit 1 of serial I/O automatic

transfer control register

Write signal from RAM to

serial I/O1 register

Write signal from serial I/O1

Transfer clock

Data pointer

(internal or SCLK output)

Receive

enabled signal

SRDY

n-1

DO1 DO2 DO3 DO4 DO5 DO6 DO7

DO6

DI1 DI2 DI3 DI4 DI5 DI6 DI7

DI7

DO0

DI7

Bit 1 write signal of serial I/O

automatic transfer control

Serial I/O output

Sout

Serial I/O input

SIN

Transfer interval

Bit 1 of serial I/O automatic

transfer control register

Write signal from RAM to

serial I/O1 register

Write signal from serial I/O1

Data pointer

m-1

DO0

Bit 3 of serial I/O automatic

transfer control register

Transfer clock

(internal)

SCLK11 output

SCLK12 output

DO1 DO2 DO3 DO4 DO5 DO6 DO7

DO0

DO6 DO7

DO0 DO1 DO2 DO3

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

DI0

DI1

DI2

DI3

DI6

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