ST7232AK2-Auto STMicroelectronics, ST7232AK2-Auto Datasheet - Page 93

• Manufacturer Part Number: ST7232AK2-Auto
• Description: 8-bit MCU for automotive, 16 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMicroelectronics

Specifications of ST7232AK2-Auto

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and bypass for external clock
• Four Power Saving Modes: halt, active halt, wait and slow
• Main Clock Controller With: real time base, beep and clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST7232Axx-Auto
Note:
1
2
3
4
5
The OC
the following formula::
Where:
t
f
PRESC
If the timer clock is an external clock the formula is:
Where:
t
f
The output compare 2 event causes the counter to be initialized to FFFCh (see
After a write instruction to the OCiHR register, the output compare function is inhibited until
the OCiLR register is also written.
The OCF1 and OCF2 bits cannot be set by hardware in PWM mode therefore the output
compare interrupt is inhibited.
The ICF1 bit is set by hardware when the counter reaches the OC2R value and can produce
a timer interrupt if the ICIE bit is set and the I bit is cleared.
In PWM mode the ICAP1 pin can not be used to perform input capture because it is
disconnected to the timer. The ICAP2 pin can be used to perform input capture (ICF2 can be
set and IC2R can be loaded) but the user must take care that the counter is reset each
period and ICF1 can also generates interrupt if ICIE is set.
When the pulse width modulation (PWM) and one pulse mode (OPM) bits are both set, the
PWM mode is the only active one.
CPU
EXT
= Signal or pulse period (in seconds)
= External timer clock frequency (in hertz)
= Signal or pulse period (in seconds)
= CPU clock frequency (in hertz)
= Timer prescaler factor (2, 4 or 8 depending on CC[1:0] bits, see
i
R register value required for a specific timing application can be calculated using
OCiR value =
OCiR =
t
*
PRESC
t
f
EXT
*
f
CPU
-5
- 5
On-chip peripherals
Table
36)
Figure
93/201
44)