MC68HC908JB16DW Freescale Semiconductor, MC68HC908JB16DW Datasheet - Page 104

• Manufacturer Part Number: MC68HC908JB16DW
• Description: IC MCU 16K FLASH 6MHZ USB 28SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908JB16DW

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 6MHz
• Connectivity: SCI, USB
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

System Integration Module (SIM)
8.4.2.1 Power-On Reset
Technical Data
104
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
external reset pin (RST) is held low while the SIM counter counts out
4096 OSCDCLK cycles. Sixty-four OSCDCLK 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:
OSCDCLK
OSCOUT
PORRST
•
•
•
•
•
•
OSC1
RST
IAB
A POR pulse is generated.
The internal reset signal is asserted.
The SIM enables the oscillator to drive OSCDCLK.
Internal clocks to the CPU and modules are held inactive for 4096
OSCDCLK cycles to allow stabilization of the oscillator.
The RST pin is driven low during the oscillator stabilization time.
The POR bit of the SIM reset status register (SRSR) is set and all
other bits in the register are cleared.
System Integration Module (SIM)
CYCLES
4096
Figure 8-7. POR Recovery
CYCLES
32
CYCLES
32
MC68HC908JB16
Freescale Semiconductor
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Rev. 1.1
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