Register Descriptions - Renesas Hitachi H8S/2194 Series Hardware Manual

28.10.3 Register Descriptions

(1) Register Configuration
Table 28.13 shows the register configuration of X-value adjustment and tracking adjustment
circuits.
Table 28.13 Register Configuration
Name
X-value and TRK-value
control register
X-value data register
TRK-value data register
(2) X-value and TRK-value Control Register (XTCR)
Bit : 7
—
Initial value :
1
—
R/W :
XTCR is an 8-bit register to determine the X-value and TRK-value adjustment circuits. Bits 6 to
2 are write-only bits. No read is valid. If a read is attempted, an undetermined value is read out.
Bits 1 and 0 are readable/writable bits. XTCR accepts only a byte access. If a word access is
attempted, operation is unassured.
It is initialized to H'80 by a reset, stand-by or module stop.
Bit 7: Reserved
No write is valid. If a read is attempted, an undetermined value is read out.
Bit 6: External Sync Signal Edge Selection Bit (CAPRF)
Selects the EXCAP edge when a selection is made to generate external sync signals.
Bit 6
CAPRF Description
0 Signal generated at the rising edge of EXCAP
1 Signal generated at both edges of EXCAP
Rev. 2.0, 11/00, page 720 of 1037
Abbrev. R/W
XTCR R/W
XDR W
TRDR W
6 5
CAPRF AT/MU TRK/X
0 0
W W
Size
Byte
Word
Word
4 3 2
EXC/REF XCS
0
0 0
W W W
Initial Value Address*
H'80 H'FD074
H'F000 H'FD070
H'F000 H'FD072
1 0
DVREF1 DVREF0
0 0
R/W R/W
(Initial value)