Datasheet

Chapter 2 Pins and Connections
MC9S08SG32 Data Sheet, Rev. 8
Freescale Semiconductor 27
2.2 Recommended System Connections
Figure 2-4 shows pin connections that are common to MC9S08SG32 Series application systems.
Figure 2-4. 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 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.
BKGD/MS
RESET
OPTIONAL
MANUAL
RESET
V
DD
BACKGROUND HEADER
PORT
B
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
C
PTC2/ADP10
PTC3/ADP11
MC9S08SG32
C2
C1
X1
R
F
R
S
PORT
A
PTA0/PIA0/TPM1CH0/TCLK/ADP0/ACMP+
PTA1/PIA1/TPM2CH0/ADP1/ACMP–
PTA2/PIA2/SDA/ACMPO/ADP2
PTA3/PIA3/SCL/ADP3
0.1 μF
V
DD
4.7 kΩ–10 kΩ
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.
4. For the 16-pin and 20-pin packages: V
DDA
/V
REFH
and V
SSA
/V
REFL
are double bonded to V
DD
and V
SS
respectively.
PTA6/TPM2CH0
PTA7/TPM2CH1
PTC4/ADP12
PTC5/ADP13
PTC6/ADP14
PTC7/ADP15
PTC0/TPM1CH0/ADP8
PTC1/TPM1CH1/ADP9
C
BY
0.1 μF
\V
REFH
\V
REFL
V
SSA
V
DDA
V
DD
V
SS
C
BY
0.1 μF
C
BLK
10 μF
+
5 V
+
SYSTEM
POWER