ST7LITE25F2 STMicroelectronics, ST7LITE25F2 Datasheet - Page 60

• Manufacturer Part Number: ST7LITE25F2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7LITE25F2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55˚C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

ST7LITE2
12-BIT AUTORELOAD TIMER (Cont’d)
11.2.6 Register Description
TIMER CONTROL STATUS REGISTER
(ATCSR)
Read / Write
Reset Value: 0x00 0000 (x0h)
Bit 7 = Reserved.
Bit 6 = ICF Input Capture Flag.
This bit is set by hardware and cleared by software
by reading the ATICR register (a read access to
ATICRH or ATICRL will clear this flag). Writing to
this bit does not change the bit value.
0: No input capture
1: An input capture has occurred
Bit 5 = ICIE IC Interrupt Enable.
This bit is set and cleared by software.
0: Input capture interrupt disabled
1: Input capture interrupt enabled
Bits 4:3 = CK[1:0] Counter Clock Selection.
These bits are set and cleared by software and
cleared by hardware after a reset. They select the
clock frequency of the counter.
Note 1: PWM mode and Output Compare modes
are not available at this frequency.
Note 2: ATICR counter may return inaccurate re-
sults when read. It is therefore not recommended
to use Input Capture mode at this frequency.
60/133
1
f
7
0
LTIMER
Counter Clock Selection
ICF
6
(1 ms timebase @ 8 MHz)
32 MHz
ICIE
OFF
f
CPU
CK1
2)
CK0
OVF
1)
CK1
OVFIE CMPIE
0
0
1
1
CK0
0
1
0
1
0
Bit 2 = OVF Overflow Flag.
This bit is set by hardware and cleared by software
by reading the TCSR register. It indicates the tran-
sition of the counter from FFFh to ATR value.
0: No counter overflow occurred
1: Counter overflow occurred
Bit 1 = OVFIE Overflow Interrupt Enable.
This bit is read/write by software and cleared by
hardware after a reset.
0: OVF interrupt disabled.
1: OVF interrupt enabled.
Bit 0 = CMPIE Compare Interrupt Enable.
This bit is read/write by software and cleared by
hardware after a reset. It can be used to mask the
interrupt generated when the CMPF bit is set.
0: CMPF interrupt disabled.
1: CMPF interrupt enabled.
COUNTER REGISTER HIGH (CNTRH)
Read only
Reset Value: 0000 0000 (000h)
COUNTER REGISTER LOW (CNTRL)
Read only
Reset Value: 0000 0000 (000h)
Bits 15:12 = Reserved.
Bits 11:0 = CNTR[11:0] Counter Value.
This 12-bit register is read by software and cleared
by hardware after a reset. The counter is incre-
mented continuously as soon as a counter clok is
selected. To obtain the 12-bit value, software
should read the counter value in two consecutive
read operations, LSB first. When a counter over-
flow occurs, the counter restarts from the value
specified in the ATR register.
CNTR7 CNTR6 CNTR5 CNTR4 CNTR3 CNTR2 CNTR1 CNTR0
15
0
7
0
0
0
CNTR
11
CNTR
10
CNTR9 CNTR8
8
0