HCS08 datasheet(27/316 Pages) NXP

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Chapter 2 Pins and Connections

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

2.2

Recommended System Connections

Figure 2-4 shows pin connections that are common to MC9S08SG8 application systems.

Figure 2-4. 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, ACMP and ADC modules, 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. In this case, there

should be a bulk electrolytic capacitor, such as a 10-

F tantalum capacitor, to provide bulk charge storage

BKGD/MS

RESET

OPTIONAL

MANUAL

RESET

VDD

BACKGROUND HEADER

SYSTEM

POWER

PORT

PTB0/PIB0/RxD/ADP4

PTB1/PIB1/TxD/ADP5

PTB2/PIB2/SPSCK/ADP6

PTB3/PIB3/MOSI/ADP7

PTB4/TPM2CH1/MISO

PTB5/TPM1CH1/SS

PTB6/SDA/XTAL

PTB7/SCL/EXTAL

PORT

PTC0/TPM1CH0/ADP8

PTC1/TPM1CH1/ADP9

PTC2/ADP10

PTC3/ADP11

MC9S08SG8

VSS

VDD

CBY

0.1 F

CBLK

10 F

5 V

PORT

PTA0/PIA0/TPM1CH0/TCLK/ADP0/ACMP+

PTA1/PIA1/TPM2CH0/ADP1/ACMP-

PTA2/PIA2/SDA/ADP2/ACMPO

PTA3/PIA3/SCL/ADP3

0.1 F

VDD

4.7 k–10 k

NOTE 1

NOTES:

1. External crystal circuit not required if using the internal clock option.

2. 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.

3. RC filter on RESET pin recommended for noisy environments.

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