E62655RUSB Renesas Electronics America, E62655RUSB Datasheet - Page 220

• Manufacturer Part Number: E62655RUSB
• Description: EMULATOR BASE H8S/2655R W/USB
• Manufacturer: Renesas Electronics America
• Type: Microcontrollerr

Specifications of E62655RUSB

• Contents: E6000 Emulator Unit and 4 Logic Probes
• For Use With/related Products: H8S/2655R
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 6 Bus Controller
6.6
6.6.1
When the H8S/2655 Group is in advanced mode, external space areas 2 to 5 can be designated as
pseudo-SRAM (PSRAM) space, and PSRAM interfacing performed. With the PSRAM interface,
PSRAM can be directly connected to the H8S/2655 Group. A PSRAM space of 2, 4, or 8 Mbytes,
or 128, 256, or 512 kbytes can be set by means of bits RMTS3 to RMTS0 in BCRH.
In the directly connected PSRAM, the refresh signal (RFSH) and output enable signal (OE) are
multiplexed. Burst operation is also possible, using static column mode.
6.6.2
Areas 2 to 5 are designated as PSRAM space by setting bits RMTS2 to RMTS0 in BCRH. The
relation between the settings of bits RMTS2 to RMTS0 and PSRAM space is shown in table 6.8.
Possible PSRAM space settings are: one area (area 2), two areas (areas 2 and 3), and four areas
(areas 2 to 5).
Table 6.8
6.6.3
If the bit in ABWCR corresponding to an area designated as PSRAM space is set to 1, that area is
designated as 8-bit PSRAM space; if the bit is cleared to 0, the area is designated as 16-bit
PSRAM space.
In 8-bit PSRAM space the upper half of the data bus, D
space both the upper and lower halves of the data bus, D
Access sizes and data alignment are the same as for the basic bus interface: see section 6.4.2, Data
Size and Data Alignment.
Rev. 5.00 Sep 14, 2006 page 190 of 1060
REJ09B0331-05000
RMTS2
1
Pseudo-SRAM Interface
Overview
Setting PSRAM Space
Data Bus
RMTS1
Settings of Bits RMTS2 to RMTS0 and Corresponding PSRAM Spaces
0
1
RMTS0
1
0
1
Area 5
Normal space
Normal space
Area 4
15
15
to D
to D
PSRAM space
8
, is enabled, while in 16-bit PSRAM
0
, are enabled.
Area 3
PSRAM space
PSRAM space
Area 2