UPD77110GC NEC [NEC], UPD77110GC Datasheet - Page 21

• Manufacturer Part Number: UPD77110GC
• Description: 16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSORS
• Manufacturer: NEC [NEC]

2.2 Arithmetic Unit
accumulator, 40-bit data ALU, 40-bit barrel shifter, and eight 40-bit general-purpose registers.
2.2.1 General-purpose registers (R0 through R7)
data memory.
through R7H (bits 31 through 16), and R0E through R7E (bits 39 through 32). Depending on the type of operation,
RnL, RnH, and RnE are used as one register or in different combinations.
2.2.2 Multiply accumulator (MAC)
outputs a 40-bit value.
arithmetically shift the 40-bit value to be added to or subtracted from the multiplication result 1 or 16 bits to the right .
2.2.3 Arithmetic logic unit (ALU)
2.2.4 Barrel shifter (BSFT: Barrel ShiFTer)
The data may be arithmetically shifted to the right shifted to the right, in which case the data is sign-extended, or
logically shifted to the right, in which case 0 is inserted from the MSB.
This unit performs multiplication, addition, logical operations, and shift, and consists of a 40-bit multiply
These eight 40-bit registers are used to input/output data for arithmetic operations, and load or store data from/to
A general-purpose register (R0 to R7) is made up of three parts: R0L through R7L (bits 15 through 0), R0H
The MAC multiplies two 16-bit values, and adds or subtracts the multiplication result from one 40-bit value, and
The MAC is provided with a shifter (MSFT: MAC ShiFTer) at the stage preceding the input stage. This shifter can
This unit inputs one or two 40-bit values, executes an arithmetic or logical operation, and outputs a 40-bit value.
The barrel shifter inputs a 40-bit value, shifts it to the left or right by any number of bits, and outputs a 40-bit value.
Data Sheet U12801EJ4V0DS00
PD77110, 77111, 77112
21