PSD4235G2V-10U STMICROELECTRONICS [STMicroelectronics], PSD4235G2V-10U Datasheet - Page 29

• Manufacturer Part Number: PSD4235G2V-10U
• Description: Flash In-System Programmable (ISP) Peripherals for 16-bit MCUs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Reading the Erase/Program Status Bits
The PSD provides several status bits to be used
by the MCU to confirm the completion of an Erase
or Program cycle of Flash memory. These status
bits minimize the time that the MCU spends per-
forming these tasks and are defined in Table 30.
The status byte resides in an even location, and
can be read as many times as needed. Also note
Table 30. Status Bits
Table 31. Status Bits for Motorola 16-bit MCU
Notes:X = Not guaranteed value, can be read either ’1’ or ’0.’
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
Data Polling
Data Polling
DQ15
DQ7
DQ15-DQ0 represent the Data Bus bits, D15-D0.
FS0-FS15/CSBOOT0-CSBOOT3 are active High.
Toggle Flag
Toggle Flag
DQ14
DQ6
Error Flag
Error Flag
DQ13
DQ5
DQ12
DQ4
X
X
Erase Time-
Erase Time-
that DQ15-DQ8 is an even byte for Motorola
MCUs with a 16-bit data bus.
For Flash memory, the MCU can perform a READ
operation to obtain these status bits while an
Erase or Program instruction is being executed by
the embedded algorithm. See the section entitled
“PROGRAMMING FLASH MEMORY”, on page
31, for details.
DQ11
DQ3
out
out
DQ10
DQ2
X
X
DQ1
DQ9
X
X
PSD4256G6V
DQ0
DQ8
X
X
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