UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 16

• Manufacturer Part Number: UPSD3234A-40U6T
• Description: IC MCU 8032 64KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3234A-40U6T

• Core Processor: 8032
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, UART/USART, USB
• Peripherals: LVR, POR, PWM, WDT
• Number Of I /o: 46
• Program Memory Size: 288KB (288K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Architecture overview
2
2.1
2.2
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Architecture overview
Memory organization
The UPSD323xx devices’ standard 8032 Core has separate 64-Kbyte address spaces for
Program memory and Data Memory. Program memory is where the 8032 executes
instructions from. Data memory is used to hold data variables. Flash memory can be
mapped in either program or data space. The Flash memory consists of two Flash memory
blocks: the main Flash memory (1 or 2 Mbit) and the Secondary Flash memory (256 Kbit).
Except during flash memory programming or update, Flash memory can only be read, not
written to. A Page Register is used to access memory beyond the 64-Kbyte address space.
Refer to the PSD module for details on mapping of the Flash memory.
The 8032 core has two types of data memory (internal and external) that can be read and
written. The internal SRAM consists of 256 bytes, and includes the stack area.
The SFR (Special Function Registers) occupies the upper 128 bytes of the internal SRAM,
the registers can be accessed by Direct addressing only. There are two separate blocks of
external SRAM inside the UPSD325X devices: one 256-byte block is assigned for DDC data
storage. Another 8 Kbytes resides in the PSD module that can be mapped to any address
space defined by the user.
Figure 4.
Registers
The 8032 has several registers; these are the Program Counter (PC), Accumulator (A), B
Register (B), the Stack Pointer (SP), the Program Status Word (PSW), General purpose
registers (R0 to R7), and DPTR (Data Pointer register).
Memory map and address space
SECONDARY
FLASH
32KB
Flash Memory Space
MAIN
FLASH
128KB
256KB
OR
FF
7F
UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
0
INT. RAM
Addressing
Addressing
Indirect
Indirect
Direct
Internal RAM Space
(256 Bytes)
or
SFR
Addressing
Direct
FFFF
FF00
EXT. RAM
(DDC)
External RAM Space
(MOVX)
256B
EXT. RAM
8KB
AI06635