MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 41

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

Chapter 3
Configuration and Mask Option Registers (CONFIG & MOR)
3.1 Introduction
This section describes the configuration registers, CONFIG1 and CONFIG2; and the mask option register
(MOR).
The configuration registers enable or disable these options:
The mask option register selects the oscillator option:
3.2 Functional Description
The configuration registers are used in the initialization of various options. The configuration registers can
be written once after each reset. All of the configuration register bits are cleared during reset. Since the
various options affect the operation of the MCU, it is recommended that these registers be written
immediately after reset. The configuration registers are located at $001E and $001F. The configuration
registers may be read at anytime.
The mask option register (MOR) is used to select the oscillator option for the MCU: crystal oscillator or
RC oscillator. The MOR is implemented as a byte in FLASH memory. Hence, writing to the MOR requires
programming the byte.
Freescale Semiconductor
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Computer operating properly module (COP)
COP timeout period (2
Internal oscillator during stop mode
Low voltage inhibit (LVI) module
LVI module voltage trip point selection
STOP instruction
Stop mode recovery time (32 or 4096 ICLK cycles)
Pull-up on IRQ pin
Crystal or RC
The options except LVIT[1:0] are one-time writable by the user after each
reset. The LVIT[1:0] bits are one-time writable by the user only after each
POR (power-on reset). The CONFIG registers are not in the FLASH
memory but are special registers containing one-time writable latches after
each reset. Upon a reset, the CONFIG registers default to predetermined
settings as shown in
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
13
–2
4
or 2
Figure 3-1
18
–2
4
ICLK cycles)
and
NOTE
Figure 3-2.
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