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R01UH0336EJ0102 Rev.1.02
Page 314 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 9 Safety Functions
(5)
MATS - Peripheral I/O Bus Maximum Access Time Set Register
This register is used to prevent blocking of access to the peripheral I/O bus by
specifying the maximum bus access time (timeout time). Access over the
peripheral I/O bus is forcibly ended when the time taken exceeds the time
specified here. At this time, the access-timeout error flag (ATO) in the APES
register is also set to 1.
Access
This register can be read/written in 8-bit units.
Address
FF45 4010
H
Initial value
00
H
This register is initialized by a reset from any source.
7
6
5
4
3
2
1
0
0
0
0
0
MATS3
MATS2
MATS1
MATS0
R
R
R
R
R/W
R/W
R/W
R/W
Table 9-6
MATS Register Contents
Bit Position
Bit Name
Function
3 to 0
MATS[3:0]
The available settings for maximum bus access time are listed below.
MATS3
MATS2
MATS1
MATS0
Access Time
0
0
0
0
2
9
/PCLK
0
0
0
1
2
10
/PCLK
0
0
1
0
2
11
/PCLK
0
0
1
1
2
12
/PCLK
0
1
0
0
2
13
/PCLK
0
1
0
1
2
14
/PCLK
0
1
1
0
2
15
/PCLK
0
1
1
1
2
16
/PCLK
Other than above
Setting prohibited
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