h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 170
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 170 of 570
- Download datasheet (5Mb)
A setting can be made in bits RCW1 and RCW0 in REFCR to delay RAS signal output by one to
three cycles. Use bits RLW1 and RLW0 in REFCR to adjust the width of the RAS signal. The
settings of bits RCW1, RCW0, RLW1, and RLW0 are valid only in refresh operations.
Figure 6.39 shows the timing when bits RCW1 and RCW0 are set.
Rev. 2.00, 03/04, page 138 of 534
Figure 6.39 CBR Refresh Timing (RCW1 = 0, RCW0 = 1, RLW1 = 0, RLW0 = 0)
φ
(
φ
RTCNT
RTCOR
Refresh request
signal and CMF bit
setting signal
,
φ
)
(
,
)
T
Rp
Figure 6.37 Compare Match Timing
Figure 6.38 CBR Refresh Timing
T
Rp
N
T
Rrw
T
Rr
T
Rr
N
T
Rc1
T
Rc1
H'00
T
Rc2
T
Rc2
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