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| MC9S08SG8 Datasheet, PDF (25/310 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 2 Pins and Connections
2.2 Recommended System Connections
Figure 2-4 shows pin connections that are common to MC9S08SG8 application systems.
BACKGROUND HEADER
MC9S08SG8
VDD
OPTIONAL
MANUAL
RESET
VDD
4.7 kâ¦â10 kâ¦
0.1 µF
BKGD/MS
RESET
PTC0/TPM1CH0/ADP8
PTC1/TPM1CH1/ADP9
PTC2/ADP10
PTC3/ADP11
PORT
C
PORT
A
PORT
B
PTA0/PIA0/TPM1CH0/TCLK/ADP0/ACMP+
PTA1/PIA1/TPM2CH0/ADP1/ACMP-
PTA2/PIA2/SDA/ADP2/ACMPO
PTA3/PIA3/SCL/ADP3
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
SYSTEM
POWER +
VDD
5V
CBLK +
10 µF
CBY
0.1 µF
VSS
RF
RS
C1
X1
C2
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.
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-µF tantalum capacitor, to provide bulk charge storage
MC9S08SG8 MCU Series Data Sheet, Rev. 0
Freescale Semiconductor
PRELIMINARY
25
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