ST72324BK2 STMicroelectronics, ST72324BK2 Datasheet - Page 75

• Manufacturer Part Number: ST72324BK2
• Description: 5V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
• Manufacturer: STMicroelectronics

Specifications of ST72324BK2

• Hdflash Endurance: 1 kcycle at 55 °C, data retention 40 years at 85 °C
• Clock Sources: crystal/ceramic resonator oscillators, int. RC osc. and ext. clock input
• 4 Power Saving Modes: Slow, Wait, Active-halt, and Halt

ST72324Bxx
10.3.3
Functional description
Counter
The main block of the programmable timer is a 16-bit free running upcounter and its
associated 16-bit registers. The 16-bit registers are made up of two 8-bit registers called
high and low.
●
●
These two read-only 16-bit registers contain the same value but with the difference that
reading the ACLR register does not clear the TOF bit (timer overflow flag), located in the
Status register (SR) (see note at the end of paragraph entitled
Writing in the CLR register or ACLR register resets the free running counter to the FFFCh
value. Both counters have a reset value of FFFCh (this is the only value which is reloaded in
the 16-bit timer). The reset value of both counters is also FFFCh in one pulse mode and
PWM mode.
The timer clock depends on the clock control bits of the CR2 register, as illustrated in
Table
clock cycles depending on the CC[1:0] bits. The timer frequency can be f
f
CPU
/8 or an external frequency.
Counter Register (CR)
–
–
Alternate Counter Register (ACR)
–
–
50. The value in the counter register repeats every 131072, 262144 or 524288 CPU
Counter High Register (CHR) is the most significant byte (MSB)
Counter Low Register (CLR) is the least significant byte (LSB)
Alternate Counter High Register (ACHR) is the most significant byte (MSB)
Alternate Counter Low Register (ACLR) is the least significant byte (LSB)
16-bit read
On-chip peripherals
CPU
sequence).
/2, f
CPU
/4,
75/193