Cypress S6J3200 Series, Руководство пользователя

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CHAPTER 1:Overview
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 23
3.
Register Attribute
3.1.
Read and Write
Refer the table with the following definition.
Table 3-1 Register Attribute of Read and Write
Attribute Definition
R It can be read.
R0 "0" is to be read.
R1 "1" is to be read.
RX The read value is undefined.
W It can be written.
W0 "0" must be written.
W1 "1" must be written.
WX Writing doesn’t affect the operation.
WN Never write
"/" (slash) The read value is same as the written value.
"," (comma) The read value is different from the written value.

Example
R/W : The written value is to be read.
R, W0 : "0" must be written, and the read value is different from the written value.
Notes:
−
The register attribute of a status register which has its clear register and set register is
conveniently described to be R/W though the written value cannot be read directly. In this case
R/W has a meaning that the controlled value is to be read.
−
A register attribute does not necessarily describe a prohibited operation of the register. Any
prohibited operations should be referred within the line of the register description as well. See
every description of the register specification together with every note.
3.2.
Protection
Refer the table with the following definition.
Table 3-2 Register Attribute of Protection
Attribute Definition
RP It can be read at the supervisor mode.
WP It can be written at the supervisor mode.
WS It can be written after cancelling the sequence protection.
WPS It can be written after cancelling the sequence protection at the supervisor mode.