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R01UH0336EJ0102 Rev.1.02
Page 310 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 9 Safety Functions
9.3.2
Details of Registers Related to the Peripheral I/O Bus
(1)
APC - Peripheral I/O Bus PSELG Control Register
This register is used to specify several forms of checking for errors in access
over the peripheral I/O bus.
Access
This register can be read/written in 8-bit units.
Address
FF45 4000
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
0
UAA
0
ATO
R
R
R
R
R
R/W
R
R/W
Table 9-2
APC Register Contents
Bit Position
Bit Name
Function
2
UAA
0: Checking for access to undefined areas does not proceed.
1: Checking for access to undefined areas proceeds.
Undefined area is the area which does not belong to the peripheral I/O area.
0
ATO
0: Checking for access timeout does not proceed.
1: Checking for access timeout proceeds.
This source flag is set when the time taken for access to the peripheral I/O bus
exceeds the maximum access time specified in the MATS register.