參數(shù)資料
型號: PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 23/100頁
文件大?。?/td> 933K
代理商: PSD4235G2-90UT
29/100
PSD4235G2
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
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
31, for details.
Table 30. Status Bits
Table 31. Status Bits for Motorola
Note: 1. X = Not guaranteed value, can be read either 1 or 0.
2. DQ15-DQ0 represent the Data Bus bits, D15-D0.
3. FS0-FS7/CSBOOT0-CSBOOT3 are active High.
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
Data Polling
Toggle Flag
Error Flag
X
Erase Time-
out
XXX
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
Data Polling
Toggle Flag
Error Flag
X
Erase Time-
out
XXX
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