mc68hc705c9a Freescale Semiconductor, Inc, mc68hc705c9a Datasheet - Page 16

• Manufacturer Part Number: mc68hc705c9a
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.4 Mask Options
The following two mask option registers are used to select features controlled by mask changes on the
MC68HC05C9A and the MC68HC05C12A:
The mask option registers are EPROM locations which must be programmed prior to operation of the
microcontroller.
1.4.1 Port B Mask Option Register (PBMOR)
The PBMOR register, shown in
each port B bit (when in input mode) has the pullup and interrupt enabled. The port B interrupts share the
vector and edge/edge-level sensitivity with the IRQ pin. For more details, (see
or Port
1.4.2 C12 Mask Option Register (C12MOR)
The C12MOR register, shown in
16
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PBPU7–PBPU0 — Port B Pullup/Interrupt Enable Bits
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1 = Pullup and CPU interrupt enabled
0 = Pullup and CPU interrupt disabled
The port D data direction register ($0007) is disabled and the seven port D pins become input only.
SPI output signals (MOSI, MISO, and SCK) do not require the data direction register control for
output capability.
The port D wire-OR mode control bit (bit 5 of SPCR $000A) is disabled, preventing open-drain
configuration of port D.
The RESET pin becomes input only.
Port B mask option register (PBMOR)
C12 mask option register (C12MOR)
Select between MC68HC05C9A/C12A configuration
Enable/disable stop mode (C12A mode only)
Enable/disable COP (C12A mode only)
Edge-triggered only or edge- and level-triggered external interrupt pin (IRQ pin) (C12A mode only).
B)).
The current capability of the port B pullup devices is equivalent to the
MC68HC05C9A, which is less than the MC68HC05C12A.
$3FF0
PBPU7
Bit 7
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Figure 1-2. Port B Mask Option Register
PBPU6
Figure
Figure
6
1-2, contains eight programmable bits which determine whether
1-3, controls the following options:
PBPU5
5
NOTE
PBPU4
4
PBPU3
3
PBPU2
2
PBPU1
4.3 External Interrupt (IRQ
1
Freescale Semiconductor
PBPU0
Bit 0