MC68HC000RC16 Freescale Semiconductor, MC68HC000RC16 Datasheet - Page 35

no-image

MC68HC000RC16

Manufacturer Part Number
MC68HC000RC16
Description
IC MPU 32BIT 16MHZ 68-PGA
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68HC000RC16

Processor Type
M680x0 32-Bit
Speed
16MHz
Voltage
3.3V, 5V
Mounting Type
Surface Mount
Package / Case
68-PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68HC000RC16
Manufacturer:
TI
Quantity:
6 000
Part Number:
MC68HC000RC16
Manufacturer:
CY
Quantity:
1 520
3.6 SYSTEM CONTROL
The system control inputs are used to reset the processor, to halt the processor, and to
signal a bus error to the processor. The outputs reset the external devices in the system
and signal a processor error halt to those devices. The three system control signals are
described in the following paragraphs.
Bus Error (
Reset (
Halt (
Mode (MODE) (MC68HC001/68EC000)
MOTOROLA
This input signal indicates a problem in the current bus cycle. The problem may be the
following:
Either the processor retries the bus cycle or performs exception processing, as
determined by interaction between the bus error signal and the halt signal.
The external assertion of this bidirectional signal along with the assertion of HALT starts
a system initialization sequence by resetting the processor. The processor assertion of
RESET (from executing a RESET instruction) resets all external devices of a system
without affecting the internal state of the processor. To reset both the processor and the
external devices, the RESET and HALT input signals must be asserted at the same
time.
An input to this bidirectional signal causes the processor to stop bus activity at the
completion of the current bus cycle. This operation places all control signals in the
inactive state and places all three-state lines in the high-impedance state (refer to Table
3-4).
When the processor has stopped executing instructions (in the case of a double bus
fault condition, for example), the HALT line is driven by the processor to indicate the
condition to external devices.
The MODE input selects between the 8-bit and 16-bit operating modes. If this input is
grounded at reset, the processor will come out of reset in the 8-bit mode. If this input is
tied high or floating at reset, the processor will come out of reset in the 16-bit mode.
This input should be changed only at reset and must be stable two clocks after RESET
is negated. Changing this input during normal operation may produce unpredictable
results.
1. No response from a device.
2. No interrupt vector number returned.
3. An illegal access request rejected by a memory management unit.
4. Some other application-dependent error.
HALT
RESET
)
BERR
)
)
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
3- 7

Related parts for MC68HC000RC16