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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 293 of 526
REJ09B0326-0600
RSR is a register used to receive serial data. Serial data input to RSR from the RXD pin is set in
the order in which it is received, starting from the LSB (bit 0), and converted to parallel data.
When one byte of data is received, it is transferred to RDR automatically.
RSR cannot be read or written directly by the CPU.
Receive Data Register (RDR)
Bit
7 6 5 4 3 2 1 0
RDR7 RDR6 RDR5 RDR4 RDR3 RDR2 RDR1 RDR0
Initial
value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
RDR is an 8-bit register that stores received serial data.
When reception of one byte of data is finished, the received data is transferred from RSR to RDR,
and the receive operation is completed. RSR is then enabled for reception. RSR and RDR are
double-buffered, allowing consecutive receive operations.
RDR is a read-only register, and cannot be written by the CPU.
RDR is initialized to H'00 upon reset, and in standby, watch, subactive, or subsleep mode.
Transmit Shift Register (TSR)
Bit
7 6 5 4 3 2 1 0
Read/Write
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 pin in order, starting
from the LSB (bit 0). When one byte of data is transmitted, the next byte of transmit data is
transferred from TDR to TSR, 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.
Summary of Contents for F-ZTAT H8/3642A Series
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Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
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Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...