MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 56

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Configuration Register (CONFIG)
56
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
NOTE:
NOTE:
Address: $001E
Most of the configuration register bits are cleared during reset. Since the
various options affect the operation of the microcontroller unit (MCU) it
is recommended that this register be written immediately after reset. The
configuration register is located at $001E and $001F, and may be read
at anytime.
The CONFIG registers are one-time writable by the user after each
reset. Upon a reset, the CONFIG registers default to predetermined
settings as shown in
Reset:
IRQPUD — IRQ Pin Pullup Control Bit
IRQEN — IRQ Pin Function Selection Bit
OSCOPT1 and OSCOPT0 — Selection Bits for Oscillator Option
RSTEN — RST Pin Function Selection
The RSTEN bit is cleared by a power-on reset (POR) only. Other resets
will leave this bit unaffected.
Read:
Write:
POR:
(0, 0) Internal oscillator
(0, 1) External oscillator
(1, 0) External RC oscillator
(1, 1) External XTAL oscillator
1 = Internal pullup is disconnected
0 = Internal pullup is connected between IRQ pin and V
1 = Interrupt request function active in pin
0 = Interrupt request function inactive in pin
1 = Reset function active in pin
0 = Reset function inactive in pin
IRQPUD
Bit 7
R
0
0
Figure 5-1 Configuration Register 2 (CONFIG2)
Configuration Register (CONFIG)
= Reserved
IRQEN
6
0
0
Figure 5-1
R
5
0
0
U = Unaffected
OSCOPT1 OSCOPT0
and
4
0
0
Figure
3
0
0
5-2.
R
2
0
0
R
1
0
0
MOTOROLA
DD
RSTEN
Bit 0
U
0