Renesas Hitachi H8S/2191, Hardware Manual

Page: 648 / 1065

Rev. 2.0, 11/00, page 621 of 1037
(3) Servo Data Register (SPDR)
0
0
1
0
2
0
3
0
4
0
5 6 7
— — —
— — —
SPDR4 SPDR3 SPDR2 SPDR1 SPDR0
1 1 1
R/W R/W R/W R/W R/W
Bit :
Initial value :
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.