參數(shù)資料
型號: SAF-XC164D-8F40F
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP100
封裝: 0.50 MM PITCH, GREEN, PLASTIC, TQFP-100
文件頁數(shù): 61/76頁
文件大?。?/td> 1143K
代理商: SAF-XC164D-8F40F
XC164D
Derivatives
Electrical Parameters
Data Sheet
62
V1.2, 2006-08
4.3.2
On-chip Flash Operation
The XC164D’s Flash module delivers data within a fixed access time (see Table 15).
Accesses to the Flash module are controlled by the PMI and take 1+WS clock cycles,
where WS is the number of Flash access waitstates selected via bitfield WSFLASH in
register IMBCTRL. The resulting duration of the access phase must cover the access
time
t
ACC of the Flash array. Therefore, the required Flash waitstates depend on the
available speed grade as well as on the actual system frequency.
Note: The Flash access waitstates only affect non-sequential accesses. Due to
prefetching mechanisms, the performance for sequential accesses (depending on
the software structure) is only partially influenced by waitstates.
In typical applications, eliminating one waitstate increases the average
performance by 5% … 15%.
Example: For an operating frequency of 40 MHz (clock cycle = 25 ns), devices can be
operated with 1 waitstate: ((1+1)
× 25 ns) ≥ 50 ns.
indicates the interrelation of waitstates and system frequency.
Note: The maximum achievable system frequency is limited by the properties of the
respective derivative, i.e. 40 MHz (or 20 MHz for XC164D-xxF20F devices).
Table 15
Flash Characteristics
(Operating Conditions apply)
Parameter
Symbol
Limit Values
Unit
Min.
Typ.
Max.
Flash module access time
t
ACC
CC
50
ns
Programming time per 128-byte block
t
PR
CC
21)
1) Programming and erase time depends on the system frequency. Typical values are valid for 40 MHz.
5ms
Erase time per sector
t
ER
CC
2001)
500
ms
Table 16
Flash Access Waitstates
Required Waitstates
Frequency Range
0 WS (WSFLASH = 00B)
f
CPU ≤ 20 MHz
1 WS (WSFLASH = 01B)
f
CPU ≤ 40 MHz
相關(guān)PDF資料
PDF描述
SAF-XC164D-8R40F 16-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP100
SAF-XC164GM-16F20F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
SAF-XC164GM-4F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
SAF-XC164GM-8F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
SAF-XC164GM-16F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
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