IDT 89HPES16NT2, User Manual

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IDT
PES16NT2 User Manual 4 April 15, 2008
Notes
Use of Hypertext
In Chapters 9 and 10 there are tables which contain register names and page numbers highlighted in
blue under the Register Definition column. In pdf files, users can jump from the source table directly to the
registers by clicking on the register name in the source table. Each register name in the table is linked
directly to the appropriate register in the register section of the chapter. To return to the source table after
having jumped to the register section, click on the same register name (in blue) in the register section.
Revision History
April 15, 2008 : Initial publication of user manual.
Read and Write Clear RW1C Software can read and write to registers/bits with this attribute.
However, writing a value of zero to a bit with this attribute has no
effect. A RW1C bit can only be set to a value of 1 by a hardware
event. To clear a RW1C bit (i.e., change its value to zero) a value
of one must be written to the location. An RW1C bit is never
cleared by hardware.
Read and Write when
Unlocked RWL Software can read the register/bits with this attribute. Writing to
register/bits with this attribute will only cause the value to be modi-
fied if the REGUNLOCK bit in the SWCNTL register is set. When
the REGUNLOCK bit is cleared, writes are ignored and the regis-
ter/bits are effectively read-only
Zero Zero A zero register or bit must be written with a value of zero and
returns a value of zero when read.
Type Abbreviation Description
Table 2 Register Terminology (Sheet 2 of 2)