SAF-XC164GM-8F20F INFINEON [Infineon Technologies AG], SAF-XC164GM-8F20F Datasheet - Page 63

• Manufacturer Part Number: SAF-XC164GM-8F20F
• Description: 16-Bit Single-Chip Microcontroller with C166SV2 Core
• Manufacturer: INFINEON [Infineon Technologies AG]

4.4.2
The XC164GM’s Flash module delivers data within a fixed access time (see
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
frequency.
Note: The Flash access waitstates only affect non-sequential accesses. Due to
Table 4-9
Parameter
Flash module access time
Programming time per 128-byte block
Erase time per sector
1)
2) Programming and erase time depends on the system frequency. Typical values are valid for 40MHz.
Example: For an operating frequency of 40 MHz (clock cycle = 25 ns), the Flash
accesses must be executed with 1 waitstate: ((1+1)
Table 4-10
Table 4-10
Required Waitstates
0 WS (WSFLASH = 00
1 WS (WSFLASH = 01
Note: The maximum achievable system frequency is limited by the properties of the
Data Sheet
The actual access time is influenced by the system frequency, see
t
ACC
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%.
respective derivative, i.e. 40 MHz (or 20 MHz for XC164GM-xF20F devices).
of the Flash array. The required Flash waitstates depend on the actual system
On-chip Flash Operation
indicates the interrelation of waitstates and system frequency.
Flash Characteristics (Operating Conditions apply)
Flash Access Waitstates
B
B
)
)
Symbol
t
t
t
ACC
PR
ER
Frequency Range
f
f
CPU
CPU
61
CC –
CC –
CC –
20 MHz
40 MHz
Min.
25 ns)
Table 4-10
Limit Values
Typ.
–
2
200
2)
50 ns.
.
Electrical Parameters
2)
50
5
500
Max.
1)
Derivatives
V1.0, 2005-11
XC164GM
Table 4-9
Unit
ns
ms
ms
).