MC9S08QD2 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MC9S08QD2

8-BIT HCS08 Microcontrollers

Freescale Semiconductor 

Chapter 1 Device Overview

Table 1-2. Versions of On-Chip Modules

Module

Analog-to-Digital Converter

Central Processing Unit

Internal Clock Source

Keyboard Interrupt

Timer Pulse-Width Modulator

(ADC)

(CPU)

(ICS)

(KBI)

(TPM)

Version

1

2

1

2

2

1.3 System Clock Distribution

Figure 1-2 shows a simplified clock connection diagram. Some modules in the MCU have selectable clock

inputs as shown. The clock inputs to the modules indicate the clock(s) that are used to drive the module

function. All memory mapped registers associated with the modules are clocked with BUSCLK.

SYSTEM CONTROL LOGIC

TCLK1

TCLK2

ICSIRCLK

ICSFFCLK

RTI

TPM1

COP

FIXED FREQ CLOCK (XCLK)

÷2

TPM2

ICS

ICSOUT

÷2

BUSCLK

CPU

ICSLCLK1

BDC

ADC2

1 ICSLCLK is the alternate BDC clock source for the MC9S08QD4 series.

2 ADC has min. and max frequency requirements. See ADC chapter and Appendix A, “Electrical Characteristics.”

3 Flash has frequency requirements for program and erase operation.See Appendix A, “Electrical Characteristics.”

Figure 1-2. System Clock Distribution Diagram

FLASH3

MC9S08QD4 Series MCU Data Sheet, Rev. 6

18

Freescale Semiconductor

Share Link: