MC68HC908BD48IFB Freescale Semiconductor, MC68HC908BD48IFB Datasheet - Page 258

• Manufacturer Part Number: MC68HC908BD48IFB
• Description: IC MCU 48K FLASH 6MHZ USB 44PQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908BD48IFB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 6MHz
• Connectivity: I²C, USB
• Peripherals: POR, PWM
• Number Of I /o: 32
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Computer Operating Properly (COP)
19.3 Functional Description
Data Sheet
258
INTERNAL RESET SOURCES
(COPRS FROM CONFIG1)
(COPD FROM CONFIG1)
RESET VECTOR FETCH
STOP INSTRUCTION
COPEN (FROM SIM)
NOTE:
COP RATE SEL
COPCTL WRITE
COPCTL WRITE
COP DISABLE
OSCXCLK
RESET
Figure 19-1
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
OSCXCLK cycles, depending on the state of the COP rate select bit,
COPRS, in configuration register 1. With a 2
overflow option, a 24MHz crystal gives a COP timeout period of
10.922ms. 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 19-1. COP Block Diagram
COP MODULE
COP CLOCK
12-BIT COP PRESCALER
Computer Operating Properly (COP)
shows the structure of the COP module.
COP COUNTER
6-BIT COP COUNTER
CLEAR
RESET STATUS REGISTER
18
18
MC68HC908BD48
– 2
RESET CIRCUIT
– 2
4
Freescale Semiconductor
4
OSCXCLK cycle
or 2
13
– 2
4
—
Rev. 2.1