LH79524/LH79525 User’s Guide Preface
Version 1.0 xxxvii
Register Tables
All Registers are presented in tabular format. A primary table presents each register’s
name, address, permissions, bit-field names and the register’s contents at reset. Subse-
quent tables detail the specific names and function(s) of all bit fields in the register and
explain any important variations that may exist.
An important detail to note is that all registers are not perfectly writable and readable.
Some will exhibit different characteristics on a write, while a read may not return the
expected result. At the same time, there will be registers whose function on a write is to
clear a value or a set of stored values, while on a read will return a specific set of values.
This is particularly true in registers that handle interrupts. Writing to a specific register may
clear a set of interrupts, while reading that same register will yield which interrupts are set.
Similarly, not all bit fields in all registers can be written, nor can all register bit fields yield
useful information when read. These restricted register bit fields will be specifically called
out with three slashes (///) and the word ‘Reserved’, along with their special conditions in
the bit field tables. See Table 1 and Table 2 for examples of this practice.
NOTES:
RO = Read Only
WO = Write Only
RW = Read and Write
Table 1. Register Name
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD /// F25 ///
RESET 0000000000000000
TYPE RO RO RO RO RO RO RW RO RO RO RO RO RO RO RO RO
ADDR —
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD /// F07F06F05F04F03F02F01F00
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RW RW RW RW RW RW RW RW
ADDR REGISTERBASE + 0x0004
Table 2. Bit Fields
BITS FIELD NAME FUNCTION
31:26 /// Reserved Reading returns 0. Values written cannot be read.
25 F25 Field 25 A description of this bit’s functionality will be found in this space.
24:8 /// Reserved Reading returns 0. Writing to this field will have no effect.
7:0 F7:F0
Field Bits [7:0] A description of these bits’ functionality will be found in
this space.
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