MC68HC711D3VFNE2 Freescale Semiconductor, MC68HC711D3VFNE2 Datasheet - Page 98

• Manufacturer Part Number: MC68HC711D3VFNE2
• Description: IC MCU 8BIT 4K FLASH 44-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711D3VFNE2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 26
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

PR[1:0] — Timer Prescaler Select
9.3.10 Timer Interrupt Flag 2 Register
TOF — Timer Overflow Interrupt Flag
RTIF — Real-Time (Periodic) Interrupt Flag
PAOVF — Pulse Accumulator Overflow Interrupt Flag
PAIF — Pulse Accumulator Input Edge Interrupt Flag
Bits [3:0]— Not implemented
9.4 Real-Time Interrupt
9-12
TFLG2 — Timer Interrupt Flag 2
RESET:
These bits are used to select the prescaler divide-by ratio. In normal modes, PR[1:0]
can only be written once, and the write must be within 64 cycles after reset. Refer to
Table 9-1 for specific timing values.
Bits in this register indicate when certain timer system events have occurred. Coupled
with the four high-order bits of TMSK2, the bits of TFLG2 allow the timer subsystem to
operate in either a polled or interrupt driven system. Each bit of TFLG2 corresponds
to a bit in TMSK2 in the same position.
Clear flags by writing a one to the corresponding bit position(s).
Set when TCNT changes from $FFFF to $0000
Refer to 9.4 Real-Time Interrupt.
Refer to 9.6 Pulse Accumulator.
Refer to 9.6 Pulse Accumulator.
Always read zero
The real-time interrupt feature, used to generate hardware interrupts at a fixed periodic
rate, is controlled and configured by two bits (RTR1 and RTR0) in the pulse accumu-
lator control (PACTL) register. The RTII bit in the TMSK2 register enables the interrupt
capability. The four different rates available are a product of the MCU oscillator fre-
quency and the value of bits RTR[1:0]. Refer to the following table, which shows the
periodic real-time interrupt rates.
Bit 7
TOF
0
RTIF
Freescale Semiconductor, Inc.
6
0
For More Information On This Product,
PAOVF
PR[1:0]
Go to: www.freescale.com
5
0
0 0
0 1
1 0
1 1
TIMING SYSTEM
PAIF
4
0
Prescaler
16
1
4
8
3
0
0
2
0
0
TECHNICAL DATA
1
0
0
$0025
Bit 0
0
0