參數(shù)資料
型號: SAK-XC161CJ-16F20F
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP144
封裝: 0.50 MM PITCH, GREEN, PLASTIC, TQFP-144
文件頁數(shù): 70/88頁
文件大小: 1191K
代理商: SAK-XC161CJ-16F20F
XC161CJ-16F
Derivatives
Electrical Parameters
Data Sheet
70
V2.4, 2006-08
4.4.2
On-chip Flash Operation
The XC161’s Flash module delivers data within a fixed access time (see Table 17).
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 xxx-16F20F devices).
Table 17
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 18
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-XC164CM-8F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
SAK-XC164CM-8F40F 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
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SAKXC161CJ16F40FAC 制造商:Infineon Technologies AG 功能描述:
SAKXC161CJ16F40FAD 制造商:Infineon Technologies AG 功能描述: