RX610 Group
11. Buses
R01UH0032EJ0120 Rev.1.20
Page 263 of 1006
Feb 20, 2013
11.3.1
CSi Control Register (CSiCNT) (i = 0 to 7)
b4
b15
b8
b7
b3
b2
b1
b0
b14
b13
b12
b11
b10
b9
b6
b5
Address: 0008 3802h (CS0CNT)
—
—
—
—
—
—
—
EMODE
—
—
—
—
—
EXENB
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
BSIZE[1:0]
Addresses: 0008 3812h to 0008 3872h (CS1CNT to CS7CNT)
—
—
—
—
—
—
—
EMODE
—
—
—
—
—
EXENB
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BSIZE[1:0]
b4
b15
b8
b7
b3
b2
b1
b0
b14
b13
b12
b11
b10
b9
b6
b5
Bit
Symbol
Bit Name
Description
R/W
b0
EXENB
Operation Enable
0: Operation is disabled
1: Operation is enabled
R/W
*
1
b3 to b1
Reserved
These bits are always read as 0. The write value should
always be 0.
R/W
b5, b4
BSIZE[1:0]
External Bus Width
Select
b5
b4
0
0: A 16-bit bus space is selected
0
1: Setting prohibited
1
0: An 8-bit bus space is selected
1
1: Setting prohibited
R/W
*
2
b7, b6
Reserved
These bits are always read as 0 and cannot be modified.
R
b8
EMODE
Endian Mode
0: Endian of area i (i = 0 to 7) is the same as the endian of
operating mode.
1: Endian of area i (i = 0 to 7) is not the endian of operating
mode.
R/W
b15 to b9
Reserved
These bits are always read as 0. The write value should
always be 0.
R/W
Notes: 1. After a reset, the value of the EXENB bit in CS0CNT is 1 and the value of the EXENB bit in CSiCNT (i = 1 to 7)
is 0.
2. The value of the BSIZE[1:0] bits in CS0CNT after a reset is 10.
CSiCNT is used to set enabling/disabling of the operation, data bus width, and endian for each area in the external
address space.
EXENB Bit (Operation Enable)
This bit enables or disables operation of the respective CS areas.
After this LSI is reset, operation is only enabled (EXENB = 1) for area 0; operation in other areas is disabled (EXENB =
0).
An attempt at access to an area for which operation has been disabled does not lead to access via the external bus.
However, if the illegal address access detection enable bit in the bus error monitoring enable register has been set to
enable detection (BEREN.IGAEN = 1), such an attempt will lead to an illegal-access error.
BSIZE[1:0] Bits (External Bus Width Select)
These bits specify the data bus width of each area. The data bus width of area 0 after a reset is 8 bits.
Summary of Contents for RX600 Series
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