MC68HC16Z1CFC16 Freescale Semiconductor, MC68HC16Z1CFC16 Datasheet - Page 149

• Manufacturer Part Number: MC68HC16Z1CFC16
• Description: IC MPU 1K RAM 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: HC16r

Specifications of MC68HC16Z1CFC16

• Core Processor: CPU16
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 132-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

5.6.5 Bus Exception Control Cycles
M68HC16 Z SERIES
USER’S MANUAL
An external device or a chip-select circuit must assert at least one of the DSACK[1:0]
signals or the AVEC signal to terminate a bus cycle normally. Bus exception control
cycles are used when bus cycles are not terminated in the expected manner. There
are two sources of bus exception control cycles.
To control termination of a bus cycle for a bus error condition properly, DSACK, BERR,
and HALT must be asserted and negated synchronously with the rising edge of
CLKOUT. This ensures that setup time and hold time requirements are met for the
same falling edge of the MCU clock when two signals are asserted simultaneously.
Refer to
ternal circuitry that provides these signals must be designed with these constraints in
mind, or the internal bus monitor must be used.
Table 5-17
cycles in relation to DSACK assertion.
• Bus error signal (BERR)
• Halt signal (HALT)
— When neither DSACK nor AVEC is asserted within a specified period after as-
— The spurious interrupt monitor asserts internal BERR when an interrupt re-
— External devices can assert BERR to indicate an external bus error.
— HALT can be asserted by an external device to cause single bus cycle opera-
sertion of AS, the internal bus monitor asserts internal BERR.
quest is acknowledged and no IARB contention occurs. BERR assertion termi-
nates a cycle and causes the MCU to process a bus error exception.
tion. HALT is typically used for debugging purposes.
APPENDIX A ELECTRICAL CHARACTERISTICS
is a summary of the acceptable bus cycle terminations for asynchronous
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Figure 5-16 LPSTOP Interrupt Mask Level
Freescale Semiconductor, Inc.
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For More Information On This Product,
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SYSTEM INTEGRATION MODULE
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Go to: www.freescale.com
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0
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0
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2
IP MASK
for more information. Ex-
1
LPSTOP MASK LEVEL
0
5-43