MC68331CEH25 Freescale Semiconductor, MC68331CEH25 Datasheet - Page 163

• Manufacturer Part Number: MC68331CEH25
• Description: IC MCU 32BIT 25MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68331CEH25

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SCI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 132-QFP
• Controller Family/series: 68K
• No. Of I/o's: 18
• Cpu Speed: 25MHz
• No. Of Timers: 1
• Embedded Interface Type: QSPI, SCI, UART
• No. Of Pwm Channels: 2
• Digital Ic Case Style: PQFP
• Rohs Compliant: Yes
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Data Ram Size: 80 B
• Interface Type: QSPI, SCI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 18
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

7.4.2 GPT Interrupts
MC68331
USER’S MANUAL
The GPT has 11 internal sources that can cause it to request interrupt service (refer
to Table 7-2). Setting bits in TMSK1 and TMSK2 enables specific interrupt sources.
TMSK1 and TMSK2 are 8-bit registers that can be addressed individually or as one
16-bit register. The registers are initialized to zero at reset. For each bit in TMSK1 and
TMSK2 there is a corresponding bit in TFLG1 and TFLG2 in the same bit position.
TMSK2 also controls the operation of the timer prescaler. Refer to 7.7 Prescaler for
more information.
The value of the interrupt level (IRL) field in the interrupt control register (ICR) deter-
mines the priority of GPT interrupt requests. IRL values correspond to MCU interrupt
request signals IRQ[7:1]. IRQ7 is the highest priority interrupt request signal; IRQ1 is
the lowest-priority signal. A value of %111 causes IRQ7 to be asserted when a GPT
interrupt request is made; lower field values cause corresponding lower-priority inter-
rupt request signals to be asserted. Setting field value to %000 disables interrupts.
The CPU32 recognizes only interrupt request signals of a priority greater than the sta-
tus register interrupt priority (IP) mask value. When the CPU acknowledges an inter-
rupt request, the priority of the acknowledged request is written to the IP mask and
driven out on the IMB address lines.
When the IP mask value driven out on the address lines is the same as the IRL value,
the GPT contends for arbitration priority. GPT arbitration priority is determined by the
value of the IARB field in GPTMCR. Each MCU module that can make interrupt re-
quests must be assigned a nonzero IARB value in order to implement an arbitration
scheme. Arbitration is performed by means of serial assertion of IARB field bit values.
When the GPT wins interrupt arbitration, it responds to the CPU interrupt acknowledge
cycle by placing an interrupt vector number on the data bus. The vector number is
used to calculate displacement into the CPU32 exception vector table. Vector num-
bers are formed by concatenating the value in the ICR IVBA field with a 4-bit value
supplied by the GPT when an interrupt request is made. Hardware prevents the vector
number from changing while it is being driven out on the IMB. Vector number assign-
ment is shown in Table 7-2.
IC4/OC5
Name
PAOV
OC1
OC2
OC3
OC4
IC1
IC2
IC3
PAI
TO
—
Number
Source
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 7-2 GPT Interrupt Sources
GENERAL-PURPOSE TIMER
Go to: www.freescale.com
Input Capture 4/Output Compare 5
Pulse Accumulator Overflow
Pulse Accumulator Input
Output Compare 1
Output Compare 2
Output Compare 3
Output Compare 4
Adjusted Channel
Input Capture 1
Input Capture 2
Input Capture 3
Timer Overflow
Source
IVBA : 0000
IVBA : 0001
IVBA : 0010
IVBA : 0011
IVBA : 0100
IVBA : 0101
IVBA : 0110
IVBA : 0111
IVBA : 1000
IVBA : 1001
IVBA : 1010
IVBA : 1011
Number
Vector
7-5
7