mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 21

• Manufacturer Part Number: mc68hc908gr8a
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1.3 MCU Block Diagram
Figure 1-1
Freescale Semiconductor
1. Ports are software configurable with pullup device if input port.
2. Higher current drive port pins
3. Pin contains integrated pullup device
FLASH PROGRAMMING (BURN-IN) ROM — 544 BYTES
V
V
DDAD
CONTROL AND STATUS REGISTERS — 64 BYTES
SSAD
MC68HC908GR8A USER FLASH — 7680 BYTES
MC68HC908GR4A USER FLASH — 4096 BYTES
CGMXFC
USER FLASH VECTOR SPACE — 36 BYTES
REGISTERS
/V
RST
/V
IRQ
OSC1
OSC2
V
V
REFH
REFL
V
V
DDA
SSA
CPU
DD
SS
(3)
(3)
MONITOR ROM — 310 BYTES
shows the structure of the MC68HC908GR8A.
USER RAM — 384 BYTES
M68HC08 CPU
CLOCK GENERATOR MODULE
8-BIT ANALOG-TO-DIGITAL
SYSTEM INTEGRATION
PHASE LOCKED LOOP
CONVERTER MODULE
1–8-MHz OSCILLATOR
INTERRUPT MODULE
SINGLE EXTERNAL
POWER-ON RESET
ARITHMETIC/LOGIC
MODULE
MODULE
POWER
UNIT (ALU)
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
Figure 1-1. MCU Block Diagram
CONFIGURATION REGISTER 1
CONFIGURATION REGISTER 2
PROGRAMMABLE TIMEBASE
SERIAL COMUNICATIONS
COMPUTER OPERATING
LOW-VOLTAGE INHIBIT
INTERFACE MODULE 1
INTERFACE MODULE 2
SINGLE BREAKPOINT
INTERRUPT MODULE
INTERFACE MODULE
SERIAL PERIPHERAL
INTERFACE MODULE
PROPERLY MODULE
MONITOR MODULE
2-CHANNEL TIMER
1-CHANNEL TIMER
4-BIT KEYBOARD
BREAK MODULE
DUAL VOLTAGE
INTERNAL BUS
MEMORY MAP
MODULE
MODULE
MODULE
MODULE
MODULE
MONITOR MODE ENTRY
MCU Block Diagram
SECURITY
MODULE
MODULE
PTA3/KBD3–
PTA0/KBD0
PTB5/AD5
PTB4/AD4
PTB3/AD3
PTB2/AD2
PTB1/AD1
PTB0/AD0
PTC1
PTC0
PTD6/T2CH0
PTD5/T1CH1
PTD4/T1CH0
PTD3/SPSCK
PTD2/MOSI
PTD1/MISO
PTD0/SS
PTE1/RxD
PTE0/TxD
(1), (2)
(1), (2)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
21