E62655RUSB Renesas Electronics America, E62655RUSB Datasheet - Page 189

• 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

16-Bit Access Space
Figure 6.5 illustrates data alignment control for the 16-bit access space. With the 16-bit access
space, the upper data bus (D
amount of data that can be accessed at one time is one byte or one word, and a longword transfer
instruction is executed as two word transfer instructions.
In byte access, whether the upper or lower data bus is used is determined by whether the address is
even or odd. The upper data bus is used for an even address, and the lower data bus for an odd
address.
Figure 6.5 Access Sizes and Data Alignment Control (16-Bit Access Space)
Byte size
Byte size
Word size
Longword
size
• Even address
• Odd address
1st bus cycle
15
to D
2nd bus cycle
8
) and lower data bus (D
D
Upper data bus
15
Rev. 5.00 Sep 14, 2006 page 159 of 1060
7
to D
D
0
) are used for accesses. The
8
D
Lower data bus
7
Section 6 Bus Controller
REJ09B0331-0500
D
0