C165_96 Datasheet, PDF (260/283 Pages) Siemens Semiconductor Group – 16-Bit CMOS Single-Chip Microcontrollers

10Jul97@15:33h
The Register Set / C165/C163
18 The Register Set
This section summarizes all registers, which are implemented in the C165/C163 and explains the
description format which is used in the chapters describing the function and layout of the SFRs.
For easy reference the registers are ordered according to two different keys (except for GPRs):
• Ordered by address, to check which register a given address references,
• Ordered by register name, to find the location of a specific register.
Register Description Format
In the respective chapters the function and the layout of the SFRs is described in a specific format
which provides a number of details about the described special function register. The example
below shows how to interpret these details.
A word register looks like this:
REG_NAME (A16_H / A8_H)
E/SFR
15 14 13 12 11 10 9 8 7 6
write hw read std hw
res. res. res. res. res. _{only bit only bit bit}
-
-
-
-
- w rw r rw rw
Reset Value: * * * *_H
543210
bitfield
bitfield
rw
rw
Bit
Function
bit(field)name Explanation of bit(field)name
Description of the functions controlled by this bit(field).
A byte register looks like this:
REG_NAME (A16_H / A8_H)
15 14 13 12 11 10 9
-
-
-
-
-
-
-
E/SFR
8765
std hw
bit bit
- rw rw
Reset Value: - - * *_H
43210
bitfield
bitfield
rw
rw
Elements:
REG_NAME Name of this register
A16 / A8
Long 16-bit address / Short 8-bit address
SFR/ESFR/XRegRegister space (SFR, ESFR or External/XBUS Register)
(* *) * *
Register contents after reset
0/1: defined value, ’X’: undefined, ’U’: unchanged (undefined (’X’) after power up)
hwbit
Bits that are set/cleared by hardware are marked with a shaded access box
Semiconductor Group
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