m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 41

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

Serial I/O Automatic Transfer Data Pointer
The serial I/O automatic transfer data pointer (address 0018
consists of 5 bits which indicate addresses in serial I/O automatic
transfer RAM (the value which adds 0F00
matic transfer data pointer is actual address in memory).
Set the value (the number of transfer data-1) to the serial I/O au-
tomatic transfer data pointer for specifying the storage address of
first data.
Fig. 17 Bit allocation of serial I/O automatic transfer RAM
Fig. 18 Serial I/O automatic transfer interval timing
Serial I/O Automatic Transfer RAM
The serial I/O automatic transfer RAM is the 32 bytes from ad-
dress 0F00
Address
0F1D
0F1E
0F00
0F01
0F02
0F1F
Serial I/O output
Transfer clock
Serial I/O input
16
16
16
Bit
16
16
16
7
16
S
to address 0F1F
OUT
S
IN
6
5
4
16
.
3
DO
DI
T
C
0
0
16
(SIODP) 0018
to the serial I/O auto-
2
DO
DI
1
1
1
DO
DI
2
2
1-byte data
0
DO
DI
3
3
16
16
DO
DI
)
4
4
DO
DI
Serial I/O Automatic Transfer Interval Register
The serial I/O automatic transfer interval register (address
001C
terval Ti during automatic transfer.
When writing the value n to the serial I/O automatic transfer inter-
val register, Ti=(n+2)
clock) occurs. However, note that this transfer interval setting is
valid only when selecting the internal clock as the clock source.
5
5
Setting of Serial I/O Automatic Transfer
Data
When data is stored in the serial I/O automatic transfer RAM,
store the first data at the address set with the serial I/O auto-
matic transfer data pointer so that the last data can be stored
at address 0F00
DO
DI
16
6
6
) consists of a 5-bit counter that determines the transfer in-
DO
DI
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7
7
16
MITSUBISHI MICROCOMPUTERS
.
Tc (Tc: the length of one bit of the transfer
T
i
3819 Group
(SIOAI) 001C
16
27