MC68HC908JB16DW Freescale Semiconductor, MC68HC908JB16DW Datasheet - Page 298

• 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: -

Computer Operating Properly (COP)
17.3 Functional Description
Technical Data
298
INTERNAL RESET SOURCES
(COPRS FROM CONFIG)
RESET VECTOR FETCH
(COPD FROM CONFIG)
STOP INSTRUCTION
COPEN (FROM SIM)
NOTE:
COPCTL WRITE
COPCTL WRITE
COP RATE SEL
COP DISABLE
OSCDCLK
RESET
Figure 17-1
The COP counter is a free-running 6-bit counter preceded by a 12-bit
prescaler counter. If not cleared by software, the COP counter overflows
and generates an asynchronous reset after 2
OSCDCLK cycles, depending on the state of the COP rate select bit,
COPRS, in configuration register 1. With a 2
overflow option, a 24MHz OSCDCLK (12MHz crystal) gives a COP
timeout period of 10.92ms. Writing any value to location $FFFF before
an overflow occurs prevents a COP reset by clearing the COP counter
and stages 12 through 5 of the prescaler.
Service the COP immediately after reset and before entering or after
exiting stop mode to guarantee the maximum time before the first COP
counter overflow.
Figure 17-1. COP Block Diagram
Computer Operating Properly (COP)
12-BIT COP PRESCALER
shows the structure of the COP module.
COP CLOCK
COP COUNTER
6-BIT COP COUNTER
CLEAR
18
RESET STATUS REGISTER
18
– 2
MC68HC908JB16
– 2
RESET CIRCUIT
Freescale Semiconductor
4
4
OSCDCLK cycle
or 2
13
– 2
4
—
Rev. 1.1