ViewSonic N2201w-1M Service Manual page 20

CPU:
The MC9S08QG4 is a member of the low-cost, high-performance HCS08 Family of 8-bit microcontroller
units (MCUs).
Block diagram:
HCS08 CORE
BDC
CPU
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
RTI COP
IRQ LVD
USER FLASH
(MC9S08QG4 = 4096 BYTES)
USER RAM
(MC9S08QG4 = 256 BYTES)
16-MHz INTERNAL CLOCK
SOURCE (ICS)
LOW-POWER OSCILLATOR
31.25 kHz to 38.4 kHz
1 MHz to 16 MHz
(XOSC)
V
SS
VOLTAGE REGULATOR
V
DD
V
DDA
V
SSA
V
REFH
V
REFL
ViewSonic Corporation
BKGD/MS
DEBUG MODULE (DBG)
8-BIT MODULO TIMER
MODULE (MTIM)
SCL
SDA
IIC MODULE (IIC)
4
8-BIT KEYBOARD
4
INTERRUPT MODULE (KBI)
ACMPO
ACMP–
ANALOG COMPARATOR
ACMP+
(ACMP)
4
10-BIT
ANALOG-TO-DIGITAL
CONVERTER (ADC)
4
TPMCH0
16-BIT TIMER/PWM
TPMCH1
MODULE (TPM)
SERIAL PERIPHERAL
INTERFACE MODULE (SPI)
RxD
SERIAL COMMUNICATIONS
TxD
INTERFACE MODULE (SCI)
EXTAL
XTAL
17
Confidential - Do Not Copy
IRQ
TCLK
PTA5//IRQ/TCLK/RESET
PTA4/ACMPO/BKGD/MS
PTA3/KBIP3/SCL/ADP3
PTA2/KBIP2/SDA/ADP2
PTA1/KBIP1/ADP1/ACMP–
PTA0/KBIP0/TPMCH0/ADP0/ACMP+
PTB7/SCL/EXTAL
PTB6/SDA/XTAL
SS
PTB5/TPMCH1/SS
MISO
PTB4/MISO
MOSI
PTB3/KBIP7/MOSI/ADP7
SPSCK
PTB2/KBIP6/SPSCK/ADP6
PTB1/KBIP5/TxD/ADP5
PTB0/KBIP4/RxD/ADP4
N2201w-1M