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ST10F272Z2 Datasheet(PDF) 48 Page - STMicroelectronics

Part # ST10F272Z2
Description  16-bit MCU with 256 Kbyte Flash memory and 20 Kbyte RAM
Download  189 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F272Z2 Datasheet(HTML) 48 Page - STMicroelectronics

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Central processing unit (CPU)
ST10F272Z2
48/189
7
Central processing unit (CPU)
The CPU includes a 4-stage instruction pipeline, a 16-bit arithmetic and logic unit (ALU) and
dedicated SFRs. Additional hardware has been added for a separate multiply and divide
unit, a bit-mask generator and a barrel shifter.
Most of the ST10F272Z2 instructions can be executed in one instruction cycle which
requires 31.25 ns at 64 MHz CPU clock. For example, shift and rotate instructions are
processed in one instruction cycle independent of the number of bits to be shifted.
Multiple-cycle instructions have been optimized: branches are carried out in 2 cycles, 16 x
16-bit multiplication in 5 cycles and a 32/16-bit division in 10 cycles.
The jump cache reduces the execution time of repeatedly performed jumps in a loop, from
2 cycles to 1 cycle.
The CPU uses a bank of 16 word registers to run the current context. This bank of General
Purpose Registers (GPR) is physically stored within the on-chip Internal RAM (IRAM) area.
A Context Pointer (CP) register determines the base address of the active register bank to
be accessed by the CPU.
The number of register banks is only restricted by the available Internal RAM space. For
easy parameter passing, a register bank may overlap others.
A system stack of up to 2048 bytes is provided as a storage for temporary data. The system
stack is allocated in the on-chip RAM area, and it is accessed by the CPU via the stack
pointer (SP) register.
Two separate SFRs, STKOV and STKUN, are implicitly compared against the stack pointer
value upon each stack access for the detection of a stack overflow or underflow.
Figure 7.
CPU block diagram (MAC Unit not included)
32
Internal
RAM
2K Byte
General
Purpose
Registers
R0
R15
MDH
MDL
Barrel-Shift
Mul./Div.-HW
Bit-Mask Gen.
ALU
16-Bit
CP
SP
STKOV
STKUN
Exec. Unit
Instr. Ptr
4-Stage
Pipeline
PSW
SYSCON
BUSCON 0
BUSCON 1
BUSCON 2
BUSCON 3
BUSCON 4
ADDRSEL 1
ADDRSEL 2
ADDRSEL 3
ADDRSEL 4
Data Pg. Ptrs
Code Seg. Ptr.
CPU
256K Byte
Flash
memory
16
16
Bank
n
Bank
i
Bank
0


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