MC68HC908AP64CB Freescale Semiconductor, MC68HC908AP64CB Datasheet - Page 184

• Manufacturer Part Number: MC68HC908AP64CB
• Description: IC MCU 64K FLASH 8MHZ 42SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AP64CB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, IRSCI, SCI, SPI
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 30
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• For Use With: DEMO908AP64E - BOARD DEMO FOR 908AP64DEMO908AP64 - BOARD DEMO FOR 908AP64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Infrared Serial Communications Interface Module (IRSCI)
12.4.1 Infrared Transmit Encoder
The infrared transmit encoder converts the "0" bits in the serial data stream from the SCI module to narrow
"low" pulses, to the TxD pin. The narrow pulse is sent with a duration of 1/32, 1/16, or 3/16 of a data bit
width. When two consecutive zeros are sent, the two consecutive narrow pulses will be separated by a
time equal to a data bit width.
12.4.2 Infrared Receive Decoder
The infrared receive decoder converts low narrow pulses from the RxD pin to standard SCI data bits. The
reference clock, SCI_R16XCLK, clocks a four bit internal counter which counts from 0 to 15. An incoming
pulse starts the internal counter and a "0" is sent out to the IR_RxD output. Subsequent incoming pulses
are ignored when the counter count is between 0 and 7; IR_RxD remains "0". Once the counter passes
7, an incoming pulse will reset the counter; IR_RxD remains "0". When the counter reaches 15, the
IR_RxD output returns to "1", the counter stops and waits for further pulses. A pulse is interpreted as jitter
if it arrives shortly after the counter reaches 15; IR_RxD remains "1".
184
INFRARED
SCI DATA
SCI DATA
SCI_R32XCLK
SCI_R16XCLK
SCI_RxD
SCI_TxD
PULSE WIDTH = 1/32, 1/16, OR 3/16 DATA BIT WIDTH
Figure 12-3. Infrared Sub-Module Diagram
Figure 12-4. Infrared SCI Data Example
MUX
MC68HC908AP Family Data Sheet, Rev. 4
IR_RxD
DATA BIT WIDTH DETERMINED BY BAUD RATE
TNP[1:0]
TRANSMIT
ENCODER
DECODER
RECEIVE
IR_TxD
IREN
MUX
Freescale Semiconductor
SCTxD
SCRxD