m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 382

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

R
R
M
23. DRAMC
e
E
3
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J
NOTES:
Table 23.1 DRAMC Specifications
Table 23.2 DRAMC-associated Pins
2
0
The DRAM controller (DRAMC) controls the DRAM area, which ranges from 512 Kbytes to 8 Mbytes. Table
23.1 lists specifications of the DRAMC.
DRAM Area
Bus Control
Refresh
Supported Function Mode EDO, fast page mode
Wait State Insertion
Table 23.2 shows pins associated with DRAMC. Signals listed in Table 23.2 are output by setting the AR2
to AR0 bits in the DRAMCONT register for the DRAM area and accessing DRAM. See Table 7.9 for RAS,
CASL, CASH and DW signal operations. Figure 23.1 shows the DRAMCONT register and REFCNT regis-
ter.
1
C
9
________
P0
P1
P3
P4
P5
P5
P5
P5
3 .
B
8 /
1. This is an example of the separate bus and 16-bit data bus.
2. This bus is available when the DS2 bit in the DS register is set to "1" (16-bit data bus) and the PM02 bit
0
1
3
0
0
0
1
2
6
in the PM0 register is set to "1" (RD/WRL/WRH in R/W mode).
3
J
Port
to P4
G
4
a
0 -
n
o r
________
3 .
1
u
, 1
3
Item
p
4
1
2
(
M
0
0
3
6
2
C
_____
Page 359
8 /
D
D
A
A
WRL / WR
WRH / BHE
RD
ALE
________
_______
____
, 3
8
16
0
8
Bus for Device Access except DRAM
to D
to D
to D
M
to A
3
2
15
_____
7
15
_______
________
20
512 KB, 1 MB, 2 MB, 4 MB, 8 MB
2CAS/1W
CAS-before-RAS refresh, Self refresh
1-wait state, 2-wait state
C
f o
8 /
4
3
8
) T
8
____
________
_______
_______
Specification
(1)
D
D
MA
MA
CASL
CASH
DW
RAS
_________
_______
_________
_____
0
8
to D
to D
0
8
to MA
to MA
Bus for DRAM Access
7
15 (2)
7
12
23. DRAMC
______