MC68HC705C8ACFNE Freescale Semiconductor, MC68HC705C8ACFNE Datasheet - Page 98

• Manufacturer Part Number: MC68HC705C8ACFNE
• Description: IC MCU 8K 2.1MHZ OTP 44-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8ACFNE

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 304 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• A/d Inputs: 4-Channel, 8-Bit
• Eeprom Memory: 0 Bytes
• Input Output: 24
• Interface: SCI/SPI
• Memory Type: OTP
• Number Of Bits: 8
• Package Type: 44-pin PLCC
• Programmable Memory: 8K Bytes
• Timers: 3-16-bit
• Voltage, Range: 3-5.5 V
• Processor Series: HC705C
• Core: HC05
• Data Bus Width: 8 bit
• Data Ram Size: 304 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 2.1 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: RoHS Compliant part

Capture/Compare Timer
8.4.4 Alternate Timer Registers
Technical Data
98
NOTE:
Reading TRH returns the current value of the high byte of the counter
and causes the low byte to be latched into a buffer, as shown in
Figure
more than once. Reading TRL reads the transparent low byte buffer and
completes the read sequence of the timer registers.
To prevent interrupts from occurring between readings of TRH and TRL,
set the interrupt mask (I bit) in the condition code register before reading
TRH, and clear the mask after reading TRL.
The alternate timer registers (ATRH and ATRL) shown in
contain the current high and low bytes of the 16-bit counter. Reading
ATRH before reading ATRL causes ATRL to be latched until ATRL is
read. Reading does not affect the timer overflow flag (TOF). Writing to
the alternate timer registers has no effect.
Freescale Semiconductor, Inc.
$0018
For More Information On This Product,
8-8. The buffer value remains fixed even if the high byte is read
15
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Capture/Compare Timer
TIMER REGISTER HIGH
Figure 8-8. Timer Register Reads
READ TRH
INTERNAL DATA BUS
LATCH
8
7
7
TIMER REGISTER LOW
LOW BYTE BUFFER
MC68HC705C8A — Rev. 3
Figure 8-9
0
0
$0019