upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 269

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Bus and Memory Control (BCU, MEMC)
Bit Position
14, 12, 10,
15
0
8, 6, 4, 0
CS7
BE70
14
Initial Value
Table 7-15
Address
Caution
Access
13
0
Bit Name
Note
CS6
BEk0
(4)
BE60
12
BEC - Endian configuration register
The 16-bit BEC register defines the endian format in which word data in the
memory is processed. Each chip select area is controlled separately.
This register can be read/written in 16-bit units.
FFFF F068
0000
This register must be initialized as described in Table 7-16 and Table 7-17.
BEC register contents
1.
2.
1.
2.
3.
Preliminary User’s Manual U17566EE1V2UM00
The bits marked with 0 must always be 0.
To initialize an external memory area after a reset, register BEC has to be
set. Do not change this register after initialization. Do not access external
devices before initialization is finished.
11
0
Accesses to all internal resources are fixed to little endian format.
Different chip select signals can be active for the same memory bank. The
priority order defines, which chip select signal is valid.
Set the chip select area which is specified as the programmable peripheral
I/O area to little endian format.
H
CS5
Function
Sets the endian format for processing of word data for each chip select area.
0: Little endian
1: Big endian
BE50
10
H
9
0
CS4
BE40
8
7
0
CS3
BE30
6
5
0
CS2
BE20
4
3
0
CS1
BE10
2
Chapter 7
1
0
CS0
BE00
0
269