mc9s08qg8 Freescale Semiconductor, Inc, mc9s08qg8 Datasheet - Page 25

• Manufacturer Part Number: mc9s08qg8
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

2.2
Figure 2-3
2.2.1
V
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.
Freescale Semiconductor
ASYNCHRONOUS
DD
INTERRUPT
V
INPUT
DD
and V
C1
NOTES:
SYSTEM
POWER
BACKGROUND HEADER
NOTE 1
Recommended System Connections
1. Not required if using the internal clock option.
2. XTAL is the same pin as PTB6; EXTAL the same pin as PTB7.
3. RESET pin can only be used to reset into user mode, you can not enter BDM using RESET pin. BDM can
4. IRQ feature has optional internal pullup device.
5. RC filter on RESET/IRQ pin recommended for noisy environments.
shows pin connections that are common to almost all MC9S08QG8/4 application systems.
SS
Power
be entered by holding MS low during POR or writing a 1 to BDFR in SBDFR with MS low after issuing BDM
command.
+
3 V
X1
are the primary power supply pins for the MCU. This voltage source supplies power to all
OPTIONAL
R
MANUAL
C
RESET
10 µF
F
BLK
C2
V
+
DD
V
DD
R
4.7 kΩ–10 kΩ
S
0.1 µF
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 1.01
0.1 µF
C
BY
Figure 2-3. Basic System Connections
V
V
XTAL
NOTE 2
NOTE 2
DD
SS
EXTAL
BKGD
RESET/IRQ
MC9S08QG8/4
PORT
PORT
B
A
PTB4/MISO
PTB6/SDA/XTAL
PTB2/KBIP6/SPSCK/ADP6
PTB5/TPMCH1/SS
PTB7/SCL/EXTAL
PTA0/KBIP0/TPMCH0/ADP0/ACMP+
PTA1/KBIP1/ADP1/ACMP–
PTA2/KBIP2/SDA/ADP2
PTA3/KBIP3/SCL/ADP3
PTA4/ACMPO/BKGD/MS
PTA5/IRQ/TCLK/RESET
PTB0/KBIP4/RxD/ADP4
PTB1/KBIP5/TxD/ADP5
PTB3/KBIP7/MOSI/ADP7
Chapter 2 External Signal Description
INTERFACE TO
APPLICATION
PERIPHERAL
SYSTEM
I/O AND
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