MC68HC908QT1VDW Freescale Semiconductor, MC68HC908QT1VDW Datasheet - Page 107

• Manufacturer Part Number: MC68HC908QT1VDW
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908QT1VDW

• Product Category: 8-bit Microcontrollers - MCU
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 1.5 KB
• Data Ram Size: 128 B
• On-chip Adc: No
• Operating Supply Voltage: 3.3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOIC-8
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Program Memory Type: Flash
• Factory Pack Quantity: 96
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

13.4.2.1 Power-On Reset
When power is first applied to the MCU, the power-on reset module (POR) generates a pulse to indicate
that power on has occurred. The SIM counter counts out 4096 BUSCLKX4 cycles. Sixty-four BUSCLKX4
cycles later, the CPU and memories are released from reset to allow the reset vector sequence to occur.
At power on, the following events occur:
See
Freescale Semiconductor
•
•
•
•
•
ADDRESS BUS
Figure
BUSCLKX4
BUSCLKX2
A POR pulse is generated.
The internal reset signal is asserted.
The SIM enables the oscillator to drive BUSCLKX4.
Internal clocks to the CPU and modules are held inactive for 4096 BUSCLKX4 cycles to allow
stabilization of the oscillator.
The POR bit of the SIM reset status register (SRSR) is set
PORRST
OSC1
RST
13-6.
Reset Recovery Type
CYCLES
4096
Figure 13-5. Sources of Internal Reset
ILLEGAL ADDRESS RST
All others
MC68HC908QY/QT Family Data Sheet, Rev. 6
ILLEGAL OPCODE RST
POR/LVI
Table 13-2. Reset Recovery Timing
Figure 13-6. POR Recovery
CYCLES
32
COPRST
POR
LVI
CYCLES
32
Actual Number of Cycles
4163 (4096 + 64 + 3)
INTERNAL RESET
67 (64 + 3)
$FFFE
Reset and System Initialization
$FFFF
107