© Semiconductor Components Industries, LLC, 2016
August, 2016 − Rev. 4
1 Publication Order Number:
AND9385/D
AND9385/D
AR0135CS
Register Reference
Introduction
This register reference is provided for engineers who are
designing cameras that use the AR0135CS.
Conventions and Notations
This document follows the conventions and notations
described below.
• Hexadecimal Numbers Have a 0x Prefix
• Binary Numbers Have 0b Prefix
Example: 0b1010 = 0xA
Register Address Space
The AR0135CS provides a 16-bit register address space
accessed through a serial interface. Each register location is
8 or 16 bits in size.
The address space is divided into the five major regions
shown in Table 1.
Table 1. ADDRESS SPACE REGIONS
Address Range
Description
0x0000–0x0FFF Reserved
0x1000–0x1FFF Reserved
0x2000–0x2FFF Reserved
0x3000–0x3FFF Manufacturer-Specific Registers (Read-Only and Read/Write Dynamic Registers)
0x4000–0xFFFF Reserved (Undefined)
Register Notation
The underlying mechanism for reading and writing
registers provides byte write capability. However, it is
convenient to consider some registers as multiple adjacent
bytes. The AR0135CS uses 8-bit, 16-bit, and 32-bit
registers, all implemented as 1 or more bytes at naturally
aligned, contiguous locations in the address space.
In this document, registers are described either by address
or by name. When registers are described by address, the
size of the registers is explicit. For example, R0x3024 is an
8-bit register at address 0x3024, and R0x3000−1 is a 16-bit
register at address 0x3000–0x3001. When registers are
described by name, the size of the register is implicit. It is
necessary to refer to the register table to determine that
model_id is a 16-bit register.
Register Aliases
A consequence of the internal architecture of the
AR0135CS is that some registers are decoded at multiple
addresses. Some registers in “configuration space” are also
decoded in “manufacturer-specific space”. To provide
unique names for all registers, the name of the register
within manufacturer-specific register space has a trailing
underscore. For example, R0x0000–1 is model_id, and
R0x3000–1 is model_id_. The effect of reading or writing
a register through any of its aliases is identical.
Bit Fields
Some registers provide control of several different pieces
of related functionality, and this makes it necessary to refer
to bit fields within registers. As an example of the notation
used for this, the least significant 4 bits of the model_id
register are referred to as model_id[3:0] or R0x0000–1[3:0].
Bit Field Aliases
In addition to the register aliases described above, some
register fields are aliased in multiple places. For example,
R0x0100 (mode_select) only has one operational bit,
R0x0100[0]. This bit is aliased to R0x301A–B[2]. The
effect of reading or writing a bit field through any of its
aliases is identical.
Byte Ordering
Registers that occupy more than 1 byte of address space
are shown with the lowest address in the highest-order byte
lane to match the byte-ordering on the bus. For example, the
model_id register is R0x3000−1. In the register table the
default value is shown as 0x0754. This means that a READ
from address 0x3000 would return 0x07, and a READ from
address 0x3001 would return 0x54. When reading this
register as two 8-bit transfers on the serial interface, the 0x07
will appear on the serial interface first, followed by the 0x54.
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APPLICATION NOTE
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