MC908JL8CDWE Datasheet, PDF (43/212 Pages) Freescale Semiconductor, Inc – Microcontrollers

3.4 Configuration Register 2 (CONFIG2)
Configuration Register 2 (CONFIG2)
Address: $001E
Bit 7
6
5
4
3
2
1
Bit 0
Read:
IRQPUD
R
Write:
R
LVIT1
LVIT0
R
R
STOP_
ICLKDIS
Reset: 0
0
0
Not affected Not affected
0
0
0
POR: 0
0
0
0
0
0
0
0
R
= Reserved
One-time writable register after each reset. LVIT1 and LVIT0 reset to logic 0 by a power-on reset (POR) only.
Figure 3-2. Configuration Register 2 (CONFIG2)
IRQPUD — IRQ Pin Pull-Up Disable Bit
IRQPUD disconnects the internal pull-up on the IRQ pin.
1 = Internal pull-up is disconnected
0 = Internal pull-up is connected between IRQ pin and V_DD
LVIT1, LVIT0 — LVI Trip Voltage Selection Bits
Detail description of trip voltage selection is given in Chapter 15 Low Voltage Inhibit (LVI).
STOP_ICLKDIS — Internal Oscillator Stop Mode Disable Bit
Setting STOP_ICLKDIS disables the internal oscillator during stop mode. When this bit is cleared, the
internal oscillator continues to operate in stop mode. Reset clears this bit.
1 = Internal oscillator disabled during stop mode
0 = Internal oscillator enabled during stop mode
3.5 Mask Option Register (MOR)
The mask option register (MOR) is implemented as a byte within the FLASH memory, and therefore can
only be written during a programming sequence of the FLASH memory. This register is read after a
power-on reset to determine the type of oscillator selected. (See Chapter 6 Oscillator (OSC).)
Address: $FFD0
Bit 7
6
Read:
OSCSEL
R
Write:
Erased: 1
1
Reset:
5
4
3
2
R
R
R
R
1
1
1
1
Unaffected by reset
1
Bit 0
R
R
1
1
Non-volatile FLASH register; write by programming.
R
= Reserved
Figure 3-3. Mask Option Register (MOR)
OSCSEL — Oscillator Select Bit
OSCSEL selects the oscillator type for the MCU. The erased or unprogrammed state of this bit is
logic 1, selecting the crystal oscillator option. This bit is unaffected by reset.
1 = Crystal oscillator
0 = RC oscillator
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
Freescale Semiconductor
43