MC908MR8MPE Freescale Semiconductor, MC908MR8MPE Datasheet - Page 97

• Manufacturer Part Number: MC908MR8MPE
• Description: IC MCU 8BIT 8K FLASH 28-PDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908MR8MPE

• 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 ~ 125°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

7.4.2.2 Computer Operating Properly (COP) Reset
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
CGMXCLK
CGMOUT
PORRST
OSC1
RST
IAB
An input to the SIM is reserved for the COP reset signal. The overflow of
the COP counter causes an internal reset and sets the COP bit in the
SIM reset status register (SRSR). The SIM actively pulls down the RST
pin for all internal reset sources.
To prevent a COP module timeout, write any value to location $FFFF.
Writing to location $FFFF clears the COP counter and bits 12–4 of the
SIM counter. The SIM counter output, which occurs at least every
2
serviced as soon as possible out of reset to guarantee the maximum
amount of time before the first timeout.
The COP module is disabled if the RST pin or the IRQ pin is held at
V
disabled only through combinational logic conditioned with the high
voltage signal on the RST or the IRQ pin. This prevents the COP from
becoming disabled as a result of external noise. During a break state,
V
13
DD
DD
CYCLES
4096
–2
+ V
+ V
4
CGMXCLK cycles, drives the COP counter. The COP should be
HI
HI
Figure 7-7. POR Recovery
System Integration Module (SIM)
while the MCU is in monitor mode. The COP module can be
on the RST pin disables the COP module.
CYCLES
32
CYCLES
32
$FFFE
System Integration Module (SIM)
Reset and System Initialization
$FFFF
Technical Data
97