S9S08QD2CSC datasheet(20/198 Pages) FREESCALE

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Chapter 2 External Signal Description

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

Figure 2-2. Basic System Connections

2.2.1

Power

VDD and VSS are the primary power supply pins for the MCU. This voltage source supplies power to all

I/O buffer circuitry, the ADC module, and to an internal voltage regulator. The internal voltage regulator

provides regulated lower-voltage source to the CPU and other internal circuitry of the MCU.

Typically, application systems have two separate capacitors across the power pins: a bulk electrolytic

capacitor, such as a 10

μF tantalum capacitor, to provide bulk charge storage for the overall system, and a

bypass capacitor, such as a 0.1

μF ceramic capacitor, located as near to the MCU power pins as practical

to suppress high-frequency noise.

VDD

VSS

RESET

OPTIONAL

MANUAL

RESET

PORT

VDD

BACKGROUND HEADER

CBY

0.1 μF

CBLK

10 μF

5 V

SYSTEM

POWER

I/O AND

PERIPHERAL

INTERFACE TO

SYSTEM

APPLICATION

PTA0/KBI1P0/TPM1CH0/ADC1P0

PTA1/KBI1P1/TPM1CH1/ADC1P1

PTA2/KBI1P2/TCLK1/ADC1P2

PTA3/KBI1P3/TCLK2/ADC1P3

VDD

PTA4/TPM2CH0O/BKGD/MS

PTA5/TPM2CH0I/IRQ/RESET

MC9S08QD4

BKGD

NOTE 2

NOTES:

1. RESET pin can only be used to reset into user mode, you can not enter BDM using RESET pin. BDM can

be entered by holding MS low during POR or writing a 1 to BDFR in SBDFR with MS low after issuing BDM

command.

2. IRQ has optional internal pullup/pulldown device

IRQ

ASYNCHRONOUS

INTERRUPT

INPUT

NOTE 1

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