MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 137
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MC68HC705X32CFU
Manufacturer Part Number
MC68HC705X32CFU
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC705X32CFU.pdf
(232 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68HC705X32CFU4
Manufacturer:
FREESCALE
Quantity:
20 000
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10.1.3
When the oscillator is running in a stable condition, the MCU is reset when a logic zero is applied
to the RESET input for a minimum period of 1.5 machine cycles (t
is used to improve noise immunity on this pin. When the RESET pin goes high, the MCU will
resume operation on the following cycle. When a reset condition occurs internally, i.e. from POR
or the COP watchdog, the RESET pin provides an active-low open drain output signal which may
be used to reset external hardware. Current limitation to protect the pull-down device is provided
in case an RC type external reset circuit is used.
Note:
10.1.4
The watchdog counter system consists of a divide-by-7 counter, preceded by a fixed divide-by-4
and a fixed divide-by-256 prescaler, plus control logic as shown in
counter can be reset by software.
Note:
MC68HC05X16
If an external RC is connected to RESET, turning on the RESET pull-down transistor
may discharge the capacitor. The device will then remain in reset until the capacitor has
recharged, after turning off the pull-down device.
The input to the watchdog system is derived from the carry output of bit 7 of the free
running timer counter. Therefore, a reset of the timer may affect the period of the
watchdog timeout.
RESET pin
Computer operating properly (COP) watchdog reset
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 10-2 RESET external RC pull-down
Go to: www.freescale.com
RESETS AND INTERRUPTS
RESET
VDD
pin
pin
MC68HC05X16
CYC
Figure
). An internal Schmitt Trigger
10-3. The divide-by-7
10-3
10
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