MC68HC705C9ACFN Freescale Semiconductor, MC68HC705C9ACFN Datasheet - Page 36

• Manufacturer Part Number: MC68HC705C9ACFN
• Description: IC MCU 2.1MHZ 16K OTP 44-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C9ACFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 352 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Interrupts
4.3 External Interrupt (IRQ or Port B)
If the interrupt mask bit (I bit) of the CCR is set, all maskable interrupts (internal and external) are disabled.
Clearing the I bit enables interrupts. The interrupt request is latched immediately following the falling edge
of IRQ. It is then synchronized internally and serviced as specified by the contents of $3FFA and $3FFB.
When any of the port B pullups are enabled, each pin becomes an additional external interrupt source
which is executed identically to the IRQ pin. Port B interrupts follow the same edge/edge-level selection
as the IRQ pin. The branch instructions BIL and BIH also respond to the port B interrupts in the same way
as the IRQ pin. See
Either a level-sensitive and edge-sensitive trigger or an edge-sensitive-only trigger operation is
selectable. In MC68HC05C9A mode, the sensitivity is software controlled by the IRQ bit in the C9A option
register ($3FDF). In the MC68HC05C12A mode, the sensitivity is determined by the C12IRQ bit in the
C12 mask option register ($3FF1).
36
Function
interrupts
interrupts
interrupts
Software
interrupt
External
interrupt
Reset
(SWI)
Timer
SCI
SPI
The internal interrupt latch is cleared in the first part of the interrupt service
routine; therefore, one external interrupt pulse can be latched and serviced
as soon as the I bit is cleared.
7.3 Port
IRQ pin port B pins
Table 4-1. Vector Addresses for Interrupts and Resets
Power-on reset
COP watchdog
RESET pin
User code
MODF bit
RDRF bit
TDRE bit
IDLE bit
SPIF bit
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
OCF bit
Source
TOF bit
ICF bit
OR bit
TC bit
B.
Local Mask
OCIE bit
TOIE bit
TCIE bit
ICIE bit
ILIE bit
RIE bit
None
None
None
SPIE
NOTE
Global Mask
None
None
I bit
I bit
I bit
I bit
(1 = Highest)
Same priority
as instruction
Priority
1
2
3
4
5
Freescale Semiconductor
$3FFC–$3FFD
$3FFE–$3FFF
$3FFA–$3FFB
$3FF8–$3FF9
$3FF6–$3FF7
$3FF4–$3FF5
Address
Vector