MC9S08SH8CTJ Datasheet, PDF (29/341 Pages) Freescale Semiconductor, Inc – MC9S08SH8 Datasheet

Chapter 2 Pins and Connections
BACKGROUND HEADER
V_DD
V_DD
4.7 kΩ–10 kΩ
OPTIONAL
MANUAL
RESET
0.1 μF
MC9S08SH8
BKGD/MS
RESET
PTC0/TPM1CH0/ADP8
PTC1/TPM1CH1/ADP9
PTC2/ADP10
PTC3/ADP11
PORT
C
PORT
A
PORT
B
PTA0/PIA0/TPM1CH0/ADP0/ACMP+
PTA1/PIA1/TPM2CH0/ADP1/ACMP-
PTA2/PIA2/SDA/ADP2
PTA3/PIA3/SCL/ADP3
PTA4/ACMPO/BKGD/MS
PTA5/IRQ/TCLK/RESET
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 ₊
5V
C_BLK +
10 μF
C_BY
0.1 μF
V_DD
V_SS
R_F
R_S
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 2-5. Basic System Connections
2.2.1 Power
V_DD and V_SS 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
for the overall system and a 0.1-μF ceramic bypass capacitor located as near to the MCU power pins as
practical to suppress high-frequency noise. Each pin must have a bypass capacitor for best noise
suppression.
MC9S08SH8 MCU Series Data Sheet, Rev. 3
Freescale Semiconductor
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