Renesas Hitachi H8S/2194 Series Hardware Manual page 648

(3) Servo Data Register (SPDR)
Bit : 7
—
Initial value : 1
R/W :
—
Stores the data of each pin (PS4 to PS0) when the servo port/general-purpose dual-purpose pin is
used as general-purpose port. If the port is accessed for read when SPCR is 1 (output), the
SPDRn value is read directly. Accordingly, this register is not affected by the state of the pin. If
the port is accessed for read when SPCR is 0 (input), the state of the pin is read out.
SPDR is an 8-bit read/write register. Bits 7-5 are reserved. No write in it is valid. If read is
attempted, an undetermined value is read out.
SPCR is initialized to H'E0 by reset or stand-by.
6 5 4
— —
SPDR4
1 1 0
R/W
— —
3 2
SPDR3 SPDR2 SPDR1
0 0
R/W R/W
Rev. 2.0, 11/00, page 621 of 1037
1 0
SPDR0
0 0
R/W R/W