sak-xc167ci-32f40f Infineon Technologies Corporation, sak-xc167ci-32f40f Datasheet - Page 74

• Manufacturer Part Number: sak-xc167ci-32f40f
• Description: 16-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

4.4.2
The XC167’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
available speed grade as well as on the actual system frequency.
Note: The Flash access waitstates only affect non-sequential accesses. Due to
Table 17
Parameter
Flash module access time (Standard)
Flash module access time (Grade A)
Programming time per 128-byte block
Erase time per sector
1) The actual access time is also influenced by the system frequency, so the frequency ranges are not fully linear.
2) Programming and erase time depends on the system frequency. Typical values are valid for 40 MHz.
Example: For an operating frequency of 40 MHz (clock cycle = 25 ns), Standard devices
must be operated with 2 waitstates: ((2+1) × 25 ns) ≥ 70 ns.
Grade A devices can be operated with 1 waitstate: ((1+1) × 25 ns) ≥ 50 ns.
Table 18
Table 18
Required Waitstates
0 WS (WSFLASH = 00
1 WS (WSFLASH = 01
2 WS (WSFLASH = 10
Note: The maximum achievable system frequency is limited by the properties of the
Data Sheet
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 xxx-32F20F devices).
Table 18
indicates the interrelation of waitstates, system frequency, and speed grade.
of the Flash array. Therefore, the required Flash waitstates depend on the
On-chip Flash Operation
.
Flash Characteristics (Operating Conditions apply)
Flash Access Waitstates
B
B
B
)
)
)
Frequency Range for
Standard Flash Speed
f
f
f
CPU
CPU
CPU
≤ 16 MHz
≤ 28 MHz
≤ 40 MHz
72
Symbol
t
t
t
t
ACC
ACC
PR
ER
CC
CC
CC
CC
Min.
–
–
–
–
Frequency Range for
Flash Speed Grade A
f
f
f
CPU
CPU
CPU
Limit Values
Electrical Parameters
Typ.
2
–
–
200
≤ 20 MHz
≤ 40 MHz
≤ 40 MHz
2)
2)
XC167CI-32F
Max.
70
50
5
500
Table 17
Derivatives
V1.1, 2006-08
1)
1)
Unit
ns
ns
ms
ms
).