General purpose timer unit
ST10F276E
Table 47. GPT1 timer input frequencies, resolutions and periods at 64 MHz
Timer input selection T2I / T3I / T4I
fCPU = 64 MHz
000b
001b
010b
011b
100b
101b
110b
111b
Prescaler factor
Input frequency
Resolution
8
16
32
64
128
256
512
1024
8 MHz
125ns
8.2ms
4 MHz
250ns
16.4ms
2 MHz
0.5µs
1 kHz
1.0µs
65.5ms
500 kHz
2.0µs
250 kHz
4.0µs
128 kHz
8.0µs
64 kHz
16.0µs
1.049s
Period maximum
32.8ms
131.1ms
262.1ms
524.3ms
Figure 17. Block diagram of GPT1
4ꢁ%5$
5ꢂ$
)NTERRUPT
REQUEST
'04ꢀ TIMER 4ꢁ
N
ꢁ
ꢁ
Nꢓꢈꢌꢌꢌꢀꢉ
Nꢓꢈꢌꢌꢌꢀꢉ
#05 CLOCK
#05 CLOCK
4ꢁ MODE
CONTROL
2ELOAD
#APTURE
4ꢁ).
N
4ꢈ/54
4ꢈ MODE
CONTROL
4ꢈ/4,
'04ꢀ TIMER 4ꢈ
5ꢂ$
4ꢈ).
4ꢈ%5$
#APTURE
2ELOAD
)NTERRUPT
REQUEST
4ꢇ MODE
CONTROL
4ꢇ).
N
#05 CLOCK
ꢁ
Nꢓꢈꢌꢌꢌꢀꢉ
)NTERRUPT
REQUEST
'04ꢀ TIMER 4ꢇ
5ꢂ$
4ꢇ%5$
'!0'2)ꢉꢉꢉꢋꢇ
86/235
Doc ID 12303 Rev 3
STMICROELECTRONICS [ ST ]
