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Chapter 7
Bus and Memory Control (BCU, MEMC)
Preliminary User’s Manual U17566EE1V2UM00
(6)
RDDLY - Read delay control register
The 8-bit RDDLY register controls the delay of the read strobe RD of the
external memory interface. It provides the option to delay the rising edge of the
RD by a half of the bus clock cycle BCLK.
Access
This register can be read/written in 8- and 1-bit units.
Address
FFFF FF00
H
Initial Value
00
H
Caution
To initialize an external memory area after a reset, this register has to be set.
Do not access external devices before initialization is finished. Do not change
this register while an external device is accessed.
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
RDDLYEN
R
R
R
R
R
R
R
R/W
Table 7-23
RDDLY register contents
Bit
position
Bit name
Function
0
RDDLYEN
Read strobe control.
0: Rising RD edge not delayed
1: Rising RD edge delayed by half BCLK clock cycle
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