Register Descriptions - Hitachi H8/3937 Series Hardware Manual

10.3.2

Register Descriptions

1. Receive shift register (RSR)
Bit
Read/Write
RSR is a register used to receive serial data. Serial data input to RSR from the RXD
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.
2. Receive data register (RDR)
Bit
RDR7
Initial value
Read/Write
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 able to receive data. 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 or module standby mode.
258
7 6 5
— — —
7 6 5
RDR6 RDR5
0 0 0
R R R
4 3
— —
4 3
RDR4 RDR3 RDR2
0 0
R R
2 1 0
— — —
pin is set in
3X
2 1 0
RDR1 RDR0
0 0 0
R R R