ST10R272LT6 STMicroelectronics, ST10R272LT6 Datasheet - Page 18

• Manufacturer Part Number: ST10R272LT6
• Description: IC MCU 16BIT LV ROMLESS 100-TQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10R272LT6

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, SSP, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 77
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-TQFP, 144-VQFP
• Processor Series: ST10R2x
• Core: ST10
• Data Bus Width: 16 bit
• Data Ram Size: 1 KB
• Interface Type: SSP, USART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 77
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: In Transition
• Other names: 497-2045

ST10R272L - MULTIPLY-ACCUMULATE UNIT (MAC)
The Parallel Data Move shifts a table of operands in parallel with a computation on those
operands. Its specific use is for signal processing algorithms like filter computation. The
following figure gives an example of Parallel Data Move with CoMACM instruction.
16 x 16 signed/unsigned parallel multiplier
The multiplier executes 16 x 16-bit parallel signed/unsigned fractional and integer multiplies.
The multiplier has two 16-bit input ports, and a 32-bit product output port. The input ports can
accept data from the MA-bus and from the MB-bus. The output is sign-extended and then
feeds a scaler that shifts the multiplier output according to the shift mode bit MP specified in
the co-processor Control Word (MCW). The product can be shifted one bit left to compensate
for the extra sign bit gained in multiplying two 16-bit signed (2’s complement) fractional
numbers if bit MP is set.
40-bit signed arithmetic unit
The arithmetic unit over 32 bits wide to allow intermediate overflow in a series of multiply/
accumulate operations. The extension flag E, contained in the most significant byte of MSW,
is set when the Accumulator has overflowed beyond the 32-bit boundary, that is, when there
are significant (non-sign) bits in the top eight (signed arithmetic) bits of the Accumulator.
The 40-bit arithmetic unit has two 40-bit input ports A and B. The A-input port accepts data
from 4 possible sources: 00,0000,0000h, 00,0000,8000h (round), the sign-extended product,
or the sign-extended data conveyed by the 32-bit bus resulting from the concatenation of MA-
and MB-buses. Product and Concatenation can be shifted left by one according to MP for the
multiplier or to the instruction for the concatenation. The B-input port is fed either by the 40-bit
shifted/not shifted and inverted/not inverted accumulator or by 00,0000,0000h. A-input and B-
18/77
1
n+2
n
n-2
n-4
Before Execution
16-bit
X
Figure 6 Example of parallel data move
IDX0
CoMACM [IDX0+], [R2+]
n+2
n
n-2
n-4
After Execution
X
X
Parallel Data Move
IDX0