CY7C63231A-PXC Cypress Semiconductor Corp, CY7C63231A-PXC Datasheet - Page 8

• Manufacturer Part Number: CY7C63231A-PXC
• Description: IC MCU 3K USB LS PERIPH 18-DIP
• Manufacturer: Cypress Semiconductor Corp
• Series: enCoRe™r

Specifications of CY7C63231A-PXC

• Applications: USB Microcontroller
• Core Processor: M8B
• Program Memory Type: OTP (3 kB)
• Controller Series: CY7C632xx
• Ram Size: 96 x 8
• Interface: USB
• Number Of I /o: 10
• Voltage - Supply: 3.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 18-DIP (0.300", 7.62mm)
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Processor Series: CY7C63xx
• Core: M8B
• Data Bus Width: 16 bit
• Program Memory Size: 3 KB
• Data Ram Size: 96 B
• Interface Type: PS2, USB
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 10
• Number Of Timers: 1
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant

Address Modes
The microcontroller supports three addressing modes for
instructions that require data operands: data, direct, and
indexed.
Data
The “Data” address mode refers to a data operand that is actually
a constant encoded in the instruction. As an example, consider
the instruction that loads A with the constant 0x30:
■
This instruction will require two bytes of code where the first byte
identifies the “MOV A” instruction with a data operand as the
second byte. The second byte of the instruction will be the
constant “0xE8h”. A constant may be referred to by name if a
prior “EQU” statement assigns the constant value to the name.
For example, the following code is equivalent to the example
shown above:
■
■
Direct
“Direct” address mode is used when the data operand is a
variable stored in SRAM. In that case, the one byte address of
the variable is encoded in the instruction. As an example,
Document #: 38-08028 Rev. *D
MOV A, 30h
DSPINIT: EQU 30h
MOV A,DSPINIT
consider an instruction that loads A with the contents of memory
address location 0x10h:
■
In normal usage, variable names are assigned to variable
addresses using “EQU” statements to improve the readability of
the assembler source code. As an example, the following code
is equivalent to the example shown above:
■
■
Indexed
“Indexed” address mode allows the firmware to manipulate
arrays of data stored in SRAM. The address of the data operand
is the sum of a constant encoded in the instruction and the
contents of the “X” register. In normal usage, the constant will be
the “base” address of an array of data and the X register will
contain an index that indicates which element of the array is
actually addressed:
■
■
■
This would have the effect of loading A with the fourth element
of the SRAM “array” that begins at address 0x10h. The fourth
element would be at address 0x13h.
MOV A, [10h]
buttons: EQU 10h
MOV A,[buttons]
array: EQU 10h
MOV X,3
MOV A,[x+array]
CY7C63221/31A
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