MC68HC705C8AB Freescale Semiconductor, MC68HC705C8AB Datasheet - Page 99

• Manufacturer Part Number: MC68HC705C8AB
• Description: IC MCU 8K OTP 2.1MHZ 42-SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8AB

• 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: 0°C ~ 70°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

MC68HC705C8A — Rev. 3
MOTOROLA
NOTE:
Register Name and Address: Alternate Timer Register High — $001A
Register Name and Address: Alternate Timer Register Low — $001B
Reading ATRH 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
To prevent interrupts from occurring between readings of ATRH and
ATRL, set the interrupt mask (I bit) in the condition code register before
reading ATRH, and clear the mask after reading ATRL.
Reset:
Reset:
Read:
Read:
Write:
Write:
Freescale Semiconductor, Inc.
$001A
Figure 8-9. Alternate Timer Registers (ATRH and ATRL)
For More Information On This Product,
8-10.
Bit 15
Bit 7
Bit 7
15
ALTERNATE TIMER REGISTER HIGH
Figure 8-10. Alternate Timer Register Reads
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Capture/Compare Timer
= Unimplemented
Bit 14
Bit 6
6
READ ATRH
Bit 13
Bit 5
5
Reset initializes ATRH to $FF
Reset initializes ATRL to $FC
INTERNAL DATA BUS
LATCH
Bit 12
Bit 4
8
4
7
7
ALTERNATE TIMER REGISTER LOW
Bit 11
Bit 3
3
LOW BYTE BUFFER
Bit 10
Bit 2
2
Capture/Compare Timer
Timer I/O Registers
Bit 9
Bit 1
1
Technical Data
0
0
$001B
Bit 0
Bit 8
Bit 0