L9803 Datasheet, PDF (43/126 Pages) STMicroelectronics – Super smart power motor driver with 8-Bit MCU, RAM, EEPROM, ADC, WDG, Timers, PWM and H-bridge driver

L9803
On-Chip Peripherals
The timer clock depends on the clock control bits of the CR2 register, as illustrated in
Table 9: Clock Control Bits. The value in the counter register repeats every 131072, 262144
or 524288 CPU clock cycles depending on the CC[1:0] bits.
The timer frequency can be f_CPU/2, f_CPU/4, f_CPU/8 or an external frequency.
Figure 19. Timer Block Diagram
ST7 INTERNAL BUS
CPU CLOCK
MCU-PERIPHERAL INTERFACE
8 high
8 low
EXEDG
8-bit
buffer
88
88
88
88
16
1/2
16 BIT
OUTPUT OUTPUT
INPUT
INPUT
1/4
1/8
FREE RUNNING
COUNTER
COMPARE
REGISTER
1
COMPARE
REGISTER
2
CAPTURE
REGISTER
1
CAPTURE
REGISTER
2
COUNTER
ALTERNATE
REGISTER
16
16
CC1 CC0
16
TIMER INTERNAL BUS
16
16
EXCLK
OVERFLOW
DETECT
CIRCUIT
OUTPUT COMPARE
CIRCUIT
6
EDGE DETECT
CIRCUIT1
EDGE DETECT
CIRCUIT2
ICAP1
ICAP2
ICF1 OCF1 TOF ICF2 OCF2 0 0 0
SR
LATCH1
LATCH2
OCMP1
OCMP2
ICIE OCIE TOIE FOLV2 FOLV1OLVL2 IEDG1 OLVL1
CR1
OC1E OC2E OPM PWM CC1 CC0 IEDG2 EXEDG
CR2
TIMER INTERRUPT
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