st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 53

• Manufacturer Part Number: st10f269z1
• Description: St10f269 16-bit Mcu With Mac Unit, 256k Byte Flash Memory And 12k Byte Ram
• Manufacturer: STMicroelectronics

ST10F269
Table 13 : GPT1 Timer Input Frequencies, Resolution and Periods (TQFP144 devices)
Figure 15 : Block Diagram of GPT1
10.2 - GPT2
The GPT2 module provides precise event control
and time measurement. It includes two timers (T5,
T6) and a capture/reload register (CAPREL). Both
timers can be clocked with an input clock which is
derived from the CPU clock via a programmable
prescaler or with external signals. The count
direction
programmable by software or may additionally be
altered dynamically by an external signal on a port
pin (TxEUD). Concatenation of the timers is
supported via the output toggle latch (T6OTL) of
timer T6 which changes its state on each timer
overflow/underflow.
The state of this latch may be used to clock timer
T5, or it may be output on a port pin (T6OUT). The
overflow / underflow of timer T6 can additionally
Pre-scaler factor
Input Freq
Resolution
Period maximum
f
CPU
= 32MHz
CPU Clock
CPU Clock
CPU Clock
T3EUD
T2EUD
T4EUD
T2IN
T3IN
(up/down)
T4IN
2
2
2
n
n
n
16.4ms
n=3...10
n=3...10
250ns
n=3...10
4MHz
000b
8
for
32.8ms
500ns
2MHz
each
001b
16
T3
Mode
Control
T4
Mode
Control
T2
Mode
Control
timer
65.5ms
1MHz
010b
1 s
32
Timer Input Selection T2I / T3I / T4I
is
Reload
Reload
Capture
Capture
500KHz
131ms
011b
2 s
64
be used to clock the CAPCOM timers T0 or T1,
and to cause a reload from the CAPREL register.
The CAPREL register may capture the contents of
timer T5 based on an external signal transition on
the corresponding port pin (CAPIN), and timer T5
may optionally be cleared after the capture
procedure. This allows absolute time differences
to be measured or pulse multiplication to be
performed without software overhead.
The capture trigger (timer T5 to CAPREL) may
also be generated upon transitions of GPT1 timer
T3
advantageous when T3 operates in Incremental
Interface Mode.
Table 14
Resolution and Period (PQFP144 devices) and
Table 15
U/D
GPT1 Timer T3
GPT1 Timer T4
GPT1 Timer T2
10 - GENERAL PURPOSE TIMER UNIT
inputs
262.1ms
250KHz
100b
128
4 s
U/D
U/D
GPT2
GPT2
T3IN
524.3ms
125KHz
101b
Timer
Timer
256
8 s
and/or
T3OTL
Input
Input
62.5KHz
1.05s
110b
16 s
T3EUD.
512
Request
Interrupt
Interrupt
Request
Interrupt
Request
T3OUT
Frequencies,
Frequencies,
31.125KHz
This
111b
1024
32 s
2.1s
53/184
is