Rev. 2.0, 11/00, page 697 of 1037
(3) Drum Phase Error Detection Control Register (DPGCR)
0
1
1
2
—
—
—
—
—
—
1
3
0
4
0
R/W
R/W
5
0
6
0
7
R/(W)
*
DPOVF
R/W
DPCS0
0
R/W
DPCS1
N/V
HSWES
1
Bit :
Initial value :
R/W :
Note:
*
Only 0 can be written
DPGCR controls the operation of drum phase error detection.
DPGCR is an 8-bit readable/writable register. Bits 2 to 0 are reserved, bit 5 accepts only read
and 0 write.
It is initialized to H'07 by a reset or stand-by.
Bits 7 and 6: Clock Source Selection Bits (DPCS1, DPCS0)
Select the clock supplied to the counter. (
φ
s = fosc/2)
Bit 7
Bit 6
DPCS1
DPCS0
Description
0
φ
s
(Initial value)
0
1
φ
s/2
0
φ
s/3
1
1
φ
s/4
Bit 5: Counter Overflow Flag (DPOVF)
The DPOVF flag indicates the overflow of the 20-bit counter. It is cleared by writing 0. Write 0
after reading 1. Also, setting has the highest priority in this flag. If a flag set and 0 write occurs
simultaneously, the latter is nullified.
Bit 5
DPOVF
Description
0
Normal state
(Initial value)
1
Indicates that an overflow has occurred in the counter
Содержание Hitachi H8S/2191
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