In-Application Programming:

The in-application programming feature allows the

microcontroller to modify its own program memory from

its application software. This allows on-the-fly software

updates in mission-critical applications that cannot

afford downtime. Alternatively, it allows the application

to develop custom loader software that can operate

under the control of the application software. The utility

ROM contains user-accessible programming functions

that erase and program memory. These functions are

described in detail in the user’s guide for this device.

Register Set

Most functions of the device are controlled by sets of

registers. These registers provide a working space for

memory operations as well as configuring and address-

ing peripheral registers on the device. Registers are

divided into two major types: system registers and

peripheral registers. The common register set, also

known as the system registers, includes the ALU, accu-

mulator registers, data pointers, interrupt vectors and

control, and stack pointer. The peripheral registers

define additional functionality that may be included by

different products based on the MAXQ architecture.

This functionality is broken up into discrete modules so

that only the features required for a given product need

to be included. The following tables show the

MAXQ3210 register set. Note that the accumulators are

8 bits wide for this device.

Microcontroller with Internal Voltage Regulator,

Piezoelectric Horn Driver, and Comparator

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11

Table 1. System Register Map

Note: Names that appear in italics indicate that all bits of a register are read-only. Names that appear in bold indicate that a register

is 16 bits wide. Registers in module AP are bit addressable.

MODULE NAME (BASE SPECIFIER)

REGISTER

INDEX

AP (8h)

A (9h)

PFX (Bh)

IP (Ch)

SP (Dh)

DPC (Eh)

DP (Fh)

0xh

AP

A[0]

PFX[0]

IP

——

—

1xh

APC

A[1]

PFX[1]

—

SP

——

2xh

—

A[2]

PFX[2]

—

IV

——

3xh

—

A[3]

PFX[3]

—

—

Offs

DP0

4xh

PSF

A[4]

PFX[4]

——

DPC

—

5xh

IC

A[5]

PFX[5]

——

GR

—

6xh

IMR

A[6]

PFX[6]

—

LC0

GRL

—

7xh

—

A[7]

PFX[7]

—

LC1

BP

DP1

8xh

SC

A[8]

—

—

—

GRS

—

9xh

—

A[9]

—

—

—

GRH

—

Axh

—

A[10]

—

—

—

GRXL

—

Bxh

IIR

A[11]

—

—

—

BP[offs]

—

Cxh

—

A[12]

—

—

—

—

—

Dxh

—

A[13]

—

—

—

—

—

Exh

CKCN

A[14]

—

—

—

—

—

Fxh

WDCN

A[15]

—

—

—

—

—