h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 473

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

16.3.6
SSTDR is an 8-bit register that stores transmit data. When 8-bit data length is selected by bits
DATS1 and DATS0 in SSCRL, SSTDR0 is valid. When 16-bit data length is selected, SSTDR0
and SSTDR1 are valid. When 32-bit data length is selected, SSTDR3 to SSTDR0 are valid. Do not
attempt to access invalid SS transmit data registers.
When the SSU detects that SSTRSR is empty, it transfers the transmit data written in SSTDR to
SSTRSR and starts transmission. If the next transmit data has already been written to SSTDR
during serial transmission, the SSU transfers the written data to SSTRSR to continue transmission.
Although SSTDR can be read or written to by the CPU and DTC at all times, to achieve reliable
serial transmission, write transmit data to SSTDR after confirming that the TDRE bit in SSSR is
set to 1. The initial value of this register is H'00.
Bit
0
Bit Name
CE
SS Transmit Data Register 3 to 0 (SSTDR3 to SSTDR0)
Initial Value
0
R/W
R/W
Section 16 Synchronous Serial Communication Unit (SSU)
Description
Conflict/Incomplete Error
Indicates that a conflict error has occurred when 0
is externally input via the
If the
operation, an incomplete error occurs because it
is determined that a master device has terminated
the transfer. Data reception does not continue
while the CE bit is set to 1. Reset the SSU internal
sequencer by setting the SRES bit in SSCRL to 1
before resuming transfer after incomplete error.
[Setting conditions]
[Clearing condition]
When a low level is input to the
master device mode (MSS in SSCRH
When a 1 is input to the
device mode (MSS in SSCRH
When 0 is written to the CE bit after reading
CE
S C S
Rev. 3.00 Oct 04, 2005 page 433 of 598
1
pin level changes to 1 during slave
S C S
S C S
pin with MSS
REJ09B0155-0300
pin during slave
S C S
0) transfer
pin in
1)
1.