MC9S08QB8 Datasheet, PDF (3/36 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit

1 MCU Block Diagram
The block diagram shows the structure of the MC9S08QB8 MCU.
MCU Block Diagram
HCS08 CORE
CPU
BDC
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
COP
IRQ
LVD
V_REFL/V_SSA
V_REFH/V_DDA
USER FLASH
(MC9S08QB8 = 8192 BYTES)
(MC9S08QB4 = 4096 BYTES)
USER RAM
(MC9S08QB8 = 512 BYTES)
(MC9S08QB4 = 256 BYTES)
ANALOG COMPARATOR
(ACMP)
12-BIT
ANALOG-TO-DIGITAL
CONVERTER (ADC)
8-BIT MODULO TIMER
MODULE (MTIM)
REAL-TIME COUNTER
(RTC)
16-BIT TIMER/PWM
MODULE (TPM)
SERIAL COMMUNICATIONS
INTERFACE MODULE (SCI)
20 MHz INTERNAL CLOCK
SOURCE (ICS)
LOW-POWER OSCILLATOR
31.25 kHz to 38.4 kHz
1 MHz to 16 MHz
(XOSC)
V_SS
V_DD
VOLTAGE REGULATOR
KEYBOARD INTERRUPT
(KBI)
PTA7
PTA6
PTA5/IRQ/TCLK/RESET
PTA4/ACMPO/BKGD/MS
PTA3/KBIP3/ADP3
PTA2/KBIP2/ADP2
PTA1/KBIP1/ADP1/ACMP–
PTA0/KBIP0/TPMCH0/ADP0/ACMP+
PTB7/EXTAL
PTB6/XTAL
PTB5/TPMCH0
PTB4
PTB3/KBIP7/ADP7
PTB2/KBIP6/ADP6
PTB1/KBIP5/TxD/ADP5
PTB0/KBIP4/RxD/ADP4
PTC7
PTC6
PTC5
PTC4
PTC3
PTC2
PTC1
PTC0
pins not available on 24-pin or 16-pin packages
pins not available on 16-pin package
1 _{VDDA/VREFH and VSSA/VREFL are double bonded to VDD and VSS respectively in16-pin package.}
Figure 1. MC9S08QB8 Series Block Diagram
MC9S08QB8 Series MCU Data Sheet, Rev. 3
Freescale Semiconductor
3