MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 32
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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† Ports are software configurable with pullup device if input port.
‡ Higher current drive port pins
* Pin contains integrated pullup device
** Pullup enabled when configured as keyboard interrupt pin
CONTROL AND STATUS REGISTERS — 80 BYTES
A
VSS
CGMXFC
V
REGISTERS
DDAREF
/V
OSC1
OSC2
* RST
V
* IRQ
V
V
USER FLASH VECTORS — 48 BYTES
REFH
REFL
V
V
DDA
SSA
CPU
DD
SS
USER FLASH — 32,256 BYTES
USER EEPROM — 512 BYTES
MONITOR ROM — 307 BYTES
USER RAM — 1024 BYTES
CLOCK GENERATOR MODULE
M68HC08 CPU
4.9125-MHz OSCILLATOR
8-BIT ANALOG-TO-DIGITAL
PHASE-LOCKED LOOP
SYSTEM INTEGRATION
SINGLE EXTERNAL IRQ
CONVERTER MODULE
ARITHMETIC/LOGIC
MODULE
MODULE
POWER
UNIT (ALU)
Figure 1-1. MC68HC908AB32 Block Diagram
4-CHANNEL TIMER INTERFACE
4-CHANNEL TIMER INTERFACE
PROGRAMMABLE INTERRUPT
SERIAL COMMUNICATIONS
COMPUTER OPERATING
INTERFACE MODULE
SERIAL PERIPHERAL
INTERFACE MODULE
INTERRUPT MODULE
PROPERLY MODULE
POWER-ON RESET
INHIBIT MODULE
TIMER MODULE
INTERNAL BUS
LOW-VOLTAGE
KEYBOARD
MODULE A
MODULE B
MODULE
PTA7 – PTA0
PTB7/ATD7 – PTB0/ATD0
PTC5 – PTC0
(PTC2/MCLK)
PTD7 – PTD0
(PTD6/TACLK)
(PTD4/TBCLK)
PTG2/KBD2 – PTG0/KBD0 **
PTH1/KBD4 – PTH0/KBD3 **
PTE7/SPSCK
PTE6/MOSI
PTE5/MISO
PTE4/SS
PTE3/TACH1
PTE2/TACH0
PTE1/RxD
PTE0/TxD
PTF7
PTF6
PTF5/TBCH1
PTF4/TBCH0
PTF3/TBCH3
PTF2/TBCH2
PTF1/TACH3
PTF0/TACH2
†
†
†‡
†
†
†
†
†
†
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