MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 135

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

10.1
The MC68HC05X32 can be reset in three ways: by the initial power-on reset function, by an active
low input to the RESET pin or by a computer operating properly (COP) watchdog reset. Any of
these resets will cause the program to go to its starting address, specified by the contents of
memory locations $3FFE and $3FFF, and cause the interrupt mask bit in the condition code
register to be set.
MC68HC05X16
V
OSC1
Internal
processor clock
RESET
Internal
address bus
Internal
data bus
DD
t
VDDR
t
OXOV
V
Resets
DD
Freescale Semiconductor, Inc.
threshold (1-2V typical)
RESETS AND INTERRUPTS
For More Information On This Product,
t
PORL
Mask options
3DFE
Go to: www.freescale.com
(Internal power-on reset)
Reset sequence
Figure 10-1 Reset timing diagram
RESETS AND INTERRUPTS
3FFE
New
PCH
t
CYC
3FFF
New
PCL
10
New
code
Program
execution
begins
PC
Op
t
RL
(or t
DOGL
)
Mask options
(External hardware reset)
Reset sequence
3DFE
3FFE
PCH
New
3FFF
New
PCL
Program
execution
begins
New
code
PC
Op
10-1
10