MC68HC705C8ACB Freescale Semiconductor, MC68HC705C8ACB Datasheet - Page 116

• Manufacturer Part Number: MC68HC705C8ACB
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705C8ACB

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 2.1MHz
• Interface Type: SCI/SPI
• Program Memory Type: EPROM
• Program Memory Size: 8KB
• Total Internal Ram Size: 304Byte
• # I/os (max): 24
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 42
• Package Type: SPDIP
• Lead Free Status / Rohs Status: Not Compliant

EPROM/OTPROM (PROM)
9.5 Control Registers
9.5.1 Option Register
Technical Data
116
Address:
This subsection describes the three registers that control memory
configuration, PROM security, and IRQ edge or level sensitivity; port B
pullups; and non-programmable COP enable/disable.
The option register shown in
sensitivity, enable the PROM security, and select the memory
configuration.
RAM0 — Random-Access Memory Control Bit 0
RAM1 — Random-Access Memory Control Bit 1
Reset:
Read:
Write:
Freescale Semiconductor, Inc.
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1 = Maps 32 bytes of RAM into page zero starting at address
0 = Provides 48 bytes of PROM at location $0020–$005F.
1 = Maps 96 bytes of RAM into page one starting at address $0100.
0 = Provides 96 bytes of PROM at location $0100.
*
Implemented as an EPROM cell
$1FDF
RAM0
Bit 7
$0030. Addresses from $0020 to $002F are reserved. This bit
can be read or written at any time, allowing memory
configuration to be changed during program execution.
This bit can be read or written at any time, allowing memory
configuration to be changed during program execution.
0
EPROM/OTPROM (PROM)
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= Unimplemented
Figure 9-4. Option Register (Option)
RAM1
6
0
5
0
0
Figure 9-4
4
0
0
U = Unaffected
is used to select the IRQ
SEC
3
*
*
MC68HC705C8A — Rev. 3
U
2
IRQ
1
1
Bit 0
0
0