HD6433832S Datasheet, PDF (251/560 Pages) Renesas Technology Corp – single-chip microcomputers

Table 10.4 Pin Configuration
Name
SCI2 clock pin
SCI2 data input pin
SCI2 data output pin
SCI2 strobe pin
SCI2 chip select pin
Abbrev.
SCK₂
SI₂
SO₂
STRB
CS
I/O
I/O
Input
Output
Output
Input
Function
SCI2 clock input/output
SCI2 receive data input
SCI2 transmit data output
SCI2 strobe signal output
SCI2 chip select signal input
Register Configuration
Table 10.5 shows the SCI2 register configuration.
Table 10.5 SCI2 Registers
Name
Abbrev.
R/W
Start address register
STAR
R/W
End address register
EDAR
R/W
Serial control register 2
SCR2
R/W
Serial control/status register 2 SCSR2
R/W
Serial data buffer (32 bytes)
—
R/W
Initial Value
H'E0
H'E0
H'E0
H'E0
Not fixed
Address
H'FFA4
H'FFA5
H'FFA6
H'FFA7
H'FF80 to H'FF9F
10.3.2 Register Descriptions
Start Address Register (STAR)
Bit
7
6
—
—
Initial value
1
1
Read/Write
—
—
5
4
3
2
1
0
—
STA4 STA3 STA2 STA1 STA0
1
0
0
0
0
0
—
R/W
R/W
R/W
R/W
R/W
STAR is an 8-bit read/write register, for designating a transfer start address in the address space
(H'FF80 to H'FF9F) allocated to the 32-byte data buffer. The lower 5 bits of STAR correspond to
the lower 5 bits of the address. The extent of continuous data transfer is defined in STAR and in
the end address register (EDAR). If the same value is designated by STAR and EDAR, only 1 byte
of data is transferred.
Bits 7 to 5 are reserved; they are always read as 1, and cannot be modified.
Upon reset, STAR is initialized to H'E0.
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