SPMCK16Z4MPV20 datasheet(105/500 Pages) FREESCALE

105 / 500 page

M68HC16 Z SERIES

CENTRAL PROCESSING UNIT

USER’S MANUAL

4-45

4.15 Recommended BDM Connection

In order to use BDM development tools when an MCU is installed in a system, Freescale

recommends that appropriate signal lines be routed to a male Berg connector or

double-row header installed on the circuit board with the MCU. Refer to Figure 4-8.

Figure 4-8 BDM Connector Pinout

4.16 Digital Signal Processing

The CPU16 performs low-frequency digital signal processing (DSP) algorithms in real

time. The most common DSP operation in embedded control applications is filtering,

but the CPU16 can perform several other useful DSP functions. These include auto-

correlation (detecting a periodic signal in the presence of noise), cross-correlation (de-

termining the presence of a defined periodic signal), and closed-loop control routines

(selective filtration in a feedback path).

Although derivation of DSP algorithms is often a complex mathematical task, the algo-

rithms themselves typically consist of a series of multiply and accumulate (MAC)

operations. The CPU16 contains a dedicated set of registers that perform MAC oper-

ations. As a group, these registers are called the MAC unit.

DSP operations generally require a large number of MAC iterations. The CPU16 in-

struction set includes instructions that perform MAC setup and repetitive MAC opera-

tions. Other instructions, such as 32-bit load and store instructions, can also be used

in DSP routines.

Many DSP algorithms require extensive data address manipulation. To increase

throughput, the CPU16 performs effective address calculations and data prefetches

during MAC operations. In addition, the MAC unit provides modulo addressing to im-

plement circular DSP buffers efficiently.

Refer to the

CPU16 Reference Manual (CPU16RM/AD) for detailed information con-

cerning the MAC unit and execution of DSP instructions.

GND

RESET

VDD

BERR

BKPT/DSCLK

FREEZE

IPIPE1/DSI

IPIPE0/DSO

BDM CONN

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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