m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 43

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

(2.3) When Selecting the Internal Clock
When selecting the internal clock, the P6
can be used as the S
When selecting the internal clock, the P6
synchronous clock output pin S
this case, the S
Select the function of the P6
with the following registers (refer to Table 2):
Fig. 20 Timing diagram during serial I/O automatic transfer (internal clock selected, S
Fig. 21 Timing during serial I/O automatic transfer (internal clock selected, S
the bit 3 (SC1
rial I/O1 control register
the bit 3 (SIOAC
register
Bit 1 write signal of serial I/O
automatic transfer control
register
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
register to RAM
Bit 3 of serial I/O automatic
transfer control register
Bit 1 write signal of serial I/O
automatic transfer control
register
Bit 1 of serial I/O automatic
Write signal from RAM to
Write signal from serial I/O1
serial I/O1 register
transfer control register
register to RAM
CLK11
3
Serial I/O output
), the bit 4(SC1
Serial I/O input
(internal or S
Transfer clock
3
S
S
) of the serial I/O automatic transfer control
Data pointer
CLK11
CLK12
RDY1
pin goes to high impedance state.
(internal)
Serial I/O output
Serial I/O input
output
output
Transfer clock
enabled signal
pin by setting SC1
Data pointer
S
S
out
CLK
IN
7
/S
Receive
CLK12
output)
RDY1
4
), and the bit 6(SC1
S
S
RDY
S
out
m
IN
/CS/S
by setting SIOAC
DO
DI
7
7
0
pin can be used as the
0
/S
CLK12
DO
4
n
DI
RDY1
1
to “1”.
1
DO
DI
and P6
2
DO
/CS/S
2
DI
DO
DI
0
0
6
3
3
DO
) of the se-
DI
3
DO
DI
CLK12
1
to “1”. In
6
1
4
4
/S
DO
DI
DO
DI
CLK11
2
5
5
2
pin
DO
DO
DI
DI
6
6
3
3
DO
DI
DO
DI
7
Transfer interval
7
4
4
When using both the S
P6
tion register to input mode. Note that switch SIOAC
transfer clock at the completion of automatic transfer.
Table 2. S
Note : SC1
DO
DI
5
7
SC1
5
/S
DO
CLK11
1
DI
RDY1
SC1
SC1
SIOAC
m-1
6
6
6
DO
DI
DO
3
4
6
DI
CLK11
and S
/CS/S
: Serial I/O1 port selection bit
: S
: Synchronous clock selection bit
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7
0
0
7
Transfer interval
3
: Synchronous clock output pin selection bit
RDY
RDY1
SC1
0
and S
CLK12
CLK12
0
DO
DI
used)
4
output selection bit
6
6
DO
DI
MITSUBISHI MICROCOMPUTERS
CLK12
n-1
used)
to the P6
7
7
CLK11
SC3
DO
DI
1
selection
0
0
3
and S
7
(SC1
SIOAC
n
DO
DI
CKL12
0
6
6
0
1
4
DO
=0) and set the P6
DI
DO
DI
3
3819 Group
by switching, switch the
7
7
0
0
P6
impedance
DO
DI
S
1
6
1
CLK11
High
/S
DO
DI
CLK11
2
2
3
DO
DI
during “H” of
3
3
P6
S
7
7
P6
CLK12
/S
direc-
CLK12
7
29