ST10F280 STMicroelectronics, ST10F280 Datasheet - Page 38

• Manufacturer Part Number: ST10F280
• Description: MCU 16BIT 512K FLASH MAC 208-PBG
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F280

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: ASC, CAN, EBI/EMI, SSC
• Peripherals: POR, PWM, WDT
• Number Of I /o: 143
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 18K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 32x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 208-PBGA
• Processor Series: ST10F28x
• Core: ST10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

ST10F280
6 - CENTRAL PROCESSING UNIT (CPU)
The CPU includes a 4-stage instruction pipeline, a
16-bit arithmetic and logic unit (ALU) and dedi-
cated SFRs. Additional hardware has been added
for a separate multiply and divide unit, a bit-mask
generator and a barrel shifter.
Most of the ST10F280’s instructions can be exe-
cuted in one instruction cycle which requires 50ns
at 40MHz CPU clock. For example, shift and
rotate instructions are processed in one instruc-
tion 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.
Figure 9 : CPU Block Diagram (MAC Unit not included)
38/186
512K Byte
memory
Flash
32
Exec. Unit
BUSCON 0
BUSCON 1
BUSCON 2
BUSCON 3
BUSCON 4
Data Pg. Ptrs
Instr. Ptr
STKUN
SYSCON
STKOV
Pipeline
PSW
4-Stage
SP
Code Seg. Ptr.
ADDRSEL 1
ADDRSEL 2
ADDRSEL 3
ADDRSEL 4
Bit-Mask Gen.
Mul./Div.-HW
Barrel-Shift
CPU
16-Bit
MDH
MDL
ALU
CP
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 1024 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.
Registers
General
Purpose
R15
R0
16
16
2K Byte
Internal
Bank
Bank
Bank
RAM
n
0
i