UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 117

• 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: -

UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
22.5.7
Table 86.
22.6
22.6.1
Functional Block
Flash Memory
Erase time-out flag (DQ3)
The Erase Time-out Flag bit (DQ3) reflects the time-out period allowed between two
consecutive Sector Erase instructions. The Erase Time-out Flag bit (DQ3) is reset to '0' after
a Sector Erase cycle for a time period of 100µs + 20% unless an additional Sector Erase
instruction is decoded. After this time period, or when the additional Sector Erase instruction
is decoded, the Erase Time-out Flag bit (DQ3) is set to ‘1’.
Status bit
1. X = Not guaranteed value, can be read either '1' or '0.'
2. DQ7-DQ0 represent the Data Bus bits, D7-D0.
3. FS0-FS7 and CSBOOT0-CSBOOT3 are active High.
Programming Flash memory
Flash memory must be erased prior to being programmed. A byte of Flash memory is
erased to all '1's (FFh), and is programmed by setting selected bits to '0'. The MCU may
erase Flash memory all at once or by-sector, but not byte-by-byte. However, the MCU may
program Flash memory byte-by-byte.
The primary and secondary Flash memories require the MCU to send an instruction to
program a byte or to erase sectors (see
Once the MCU issues a Flash memory Program or Erase instruction, it must check for the
status bits for completion. The embedded algorithms that are invoked support several
means to provide status to the MCU. Status may be checked using any of three methods:
Data Polling, Data Toggle, or Ready/Busy (PC3).
Data Polling
Polling on the Data Polling Flag bit (DQ7) is a method of checking whether a Program or
Erase cycle is in progress or has completed.
When the MCU issues a Program instruction, the embedded algorithm begins. The MCU
then reads the location of the byte to be programmed in Flash memory to check status. The
Data Polling Flag bit (DQ7) of this location becomes the complement of b7 of the original
data byte to be programmed. The MCU continues to poll this location, comparing the Data
Polling Flag bit (DQ7) and monitoring the Error Flag bit (DQ5). When the Data Polling Flag
bit (DQ7) matches b7 of the original data, and the Error Flag bit (DQ5) remains '0,' the
embedded algorithm is complete. If the Error Flag bit (DQ5) is '1,' the MCU should test the
Data Polling Flag bit (DQ7) again since the Data Polling Flag bit (DQ7) may have changed
simultaneously with the Error Flag bit (DQ5) (see
The Error Flag bit (DQ5) is set if either an internal time-out occurred while the embedded
algorithm attempted to program the byte or if the MCU attempted to program a '1' to a bit
that was not erased (not erased is logic '0').
CSBOOT0-
CSBOOT3
FS0-FS7/
V
IH
Polling
Data
DQ7
Toggle
DQ6
Flag
Error
DQ5
Flag
Table
Figure 51
85).
DQ4
X
Figure
shows the Data Polling algorithm.
Time-out
51).
Erase
DQ3
DQ2
X
Memory blocks
DQ1
X
117/189
DQ0
X