m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 38

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

Fig. 13 Serial I/O block diagram
24
Note: Selected with the synchronous clock selection bit, S
I/O1 control register), automatic transfer control bit, and synchronous clock output pin selection bit (these 2 bits are ofthe serial I/O
automatic transfer register).
P6
P6
CS/S
P6
P5
P5
P5
P5
P5
P5
P6
P5
P5
7
6
5
3
1
7
5
/S
/S
2
6
/S
/S
/S
/S
/S
/S
/S
4
0
4
RDY1
CLK12
CLK11
/S
/S
/S
X
OUT1
RDY2
OUT2
RDY3
OUT3
CLK2
CLK3
X
CIN
IN1
IN2
IN3
IN
/
Serial I/O1 port selection bit
Serial I/O2 port selection bit
Serial I/O3 port selection bit
Serial I/O1 port selection bit
Serial I/O2 port selection bit
Serial I/O3 port selection bit
“1”
“0”
S
S
RDY2
RDY2
Internal
system clock
selection bit
(Note)
output selection bit
output selection bit
CS
“0”
“1”
Main
address bus
“0”
“0”
“1”
“1”
P5
P5
P6
“0”
“1”
“0”
“1”
P6
“0”
“1”
“0”
“1”
“0”
“1”
3
7
6
7
latch
latch
latch
P6
P5
P5
latch
5
1
5
S
P5
S
P5
S
latch
latch
latch
RDY2
RDY3
RDY1
2
6
latch
latch
Local
address bus
Address decorder
Synchronization
Synchronization
Synchronization
Synchronous
clock selection
bit
Synchronous
clock selection
bit
circuit
circuit
circuit
External clock
RDY1
External clock
External clock
Serial I/O shift register 1(8)
Serial I/O shift register 2(8)
Serial I/O shift register 3(8)
output selection bit, serial I/O1 port selection bit (these 3 bits are of the serial
SI/O automatic transfer
Serial I/O counter 1(3)
Serial I/O counter 2(3)
Serial I/O counter 3(3)
“1”
“1”
“1”
(0F00
interval register
“0”
“0”
“0”
SI/O automatic
transfer RAM
16
SI/O automatic
SI/O automatic
Internal synchronous
clock selection bit
Internal synchronous
clock selection bit
Internal synchronous
clock selection bit
transfer data
to 0F1F
1/8
1/16
1/32
1/64
1/128
1/256
1/8
1/16
1/32
1/64
1/128
1/256
1/8
1/16
1/32
1/64
1/128
1/256
controller
transfer
pointer
16
)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Main data
bus
MITSUBISHI MICROCOMPUTERS
Local data
bus
Serial I/O automatic
transfer interrupt request
Serial I/O1
interrupt request
Serial I/O2
interrupt request
Serial I/O3
interrupt request
3819 Group