MC68HC908MR8CP Freescale Semiconductor, MC68HC908MR8CP Datasheet - Page 99

• Manufacturer Part Number: MC68HC908MR8CP
• Description: IC MCU 8K FLASH 8MHZ PWM 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908MR8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 12
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

7.5 SIM Counter
7.5.1 SIM Counter During Power-On Reset
7.5.2 SIM Counter and Reset States
7.6 Exception Control
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
The SIM counter is used by the POR module to allow the oscillator time
to stabilize before enabling the internal bus (IBUS) clocks. The SIM
counter also serves as a prescaler for the COP module. The SIM counter
overflow supplies the clock for the COP module. The SIM counter is 13
bits long and is clocked by the falling edge of CGMXCLK.
The POR detects power applied to the MCU. At power-on, the POR
circuit asserts the signal PORRST. Once the SIM is initialized, it enables
the clock generation module (CGM) to drive the bus clock state machine.
External reset has no effect on the SIM counter. The SIM counter is
free-running after all reset states. See
Internal Sources
sequences.
Normal, sequential program execution can be changed in three different
ways:
1. Interrupts:
2. Reset
3. Break interrupts
a. Maskable hardware CPU interrupts
b. Non-maskable software interrupt instruction (SWI)
System Integration Module (SIM)
for counter control and internal reset recovery
7.4.2 Active Resets from
System Integration Module (SIM)
Technical Data
SIM Counter
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