MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 154

• Manufacturer Part Number: MC68HC711P2CFN4
• Description: IC MCU 32K OTP 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711P2CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: MI Bus, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 640 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Timing System
8.6 Real-time interrupt
Technical Data
The real-time interrupt (RTI) feature, used to generate hardware
interrupts at a fixed periodic rate, is controlled and configured by two bits
(RTR1 and RTR0) in the pulse accumulator 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
frequency and the value of bits RTR[1:0]. Refer to
shows the periodic real-time interrupt rates.
The clock source for the RTI function is a free-running clock that cannot
be stopped or interrupted except by reset. This clock causes the time
between successive RTI timeouts to be a constant that is independent
of the software latency associated with flag clearing and service. For this
reason, an RTI period starts from the previous timeout, not from when
RTIF is cleared.
Every timeout causes the RTIF bit in TFLG2 to be set, and if RTII is set,
an interrupt request is generated. After reset, one entire RTI period
elapses before the RTIF flag is set for the first time. Refer to the TMSK2,
TFLG2, and PACTL registers.
Freescale Semiconductor, Inc.
For More Information On This Product,
RTR[1:0]
0 0
0 1
1 0
1 1
Go to: www.freescale.com
Timing System
E = 3MHz
10.923ms
21.845ms
2.731ms
5.461ms
Table 8-2. RTI periodic rates
E = 2MHz
16.384ms
32.768ms
4.096ms
8.192ms
E = 1MHz
16.384ms
32.768ms
65.536ms
8.192ms
MC68HC11P2 — Rev 1.0
Table
E = xMHz
2
2
2
2
13
14
15
16
8-2, which
/E
/E
/E
/E