HD6433935 Hitachi, HD6433935 Datasheet - Page 271
HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
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3. Transmit shift register (TSR)
TSR is a register used to transmit serial data. Transmit data is first transferred from TDR to TSR,
and serial data transmission is carried out by sending the data to the TXD
from the LSB (bit 0). When one byte of data is transmitted, the next byte of transmit data is
transferred to TDR, and transmission started, automatically. Data transfer from TDR to TSR is
not performed if no data has been written to TDR (if bit TDRE is set to 1 in the serial status
register (SSR)).
TSR cannot be read or written directly by the CPU.
4. Transmit data register (TDR)
TDR is an 8-bit register that stores transmit data. When TSR is found to be empty, the transmit
data written in TDR is transferred to TSR, and serial data transmission is started. Continuous
transmission is possible by writing the next transmit data to TDR during TSR serial data
transmission.
TDR can be read or written by the CPU at any time.
TDR is initialized to H'FF upon reset, and in standby, watch or module standby mode.
Bit
Initial value
Read/Write
Bit
Read/Write
TDR7
R/W
—
7
1
7
TDR6
R/W
—
6
1
6
TDR5
R/W
—
5
1
5
TDR4
R/W
—
4
1
4
TDR3
R/W
—
3
1
3
TDR2
R/W
—
2
1
2
3X
pin in order, starting
TDR1
R/W
—
1
1
1
TDR0
R/W
—
0
1
0
259
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