ST7MC2R6 STMicroelectronics, ST7MC2R6 Datasheet - Page 170

• Manufacturer Part Number: ST7MC2R6
• Description: 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
• Manufacturer: STMicroelectronics

Specifications of ST7MC2R6

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and by-pass for external clock, clock security system.
• 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, external clock input, PWM and pulse generator modes
• 8-bit Pwm Auto-reload Timer With: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector

ST7MC1xx/ST7MC2xx
MOTOR CONTROLLER (Cont’d)
Figure 92. Step Ratio Functional Diagram
170/309
1
** Only in Auto-switched mode (SWA=1 in MCRA register)
MCOMP = MCOMP/2**
MZREG = MZREG / 2
MDREG = MDREG/2
MTIM Timer Overflow
Ratio = Ratio + 1
MZPRV = MZPRV/2
Counter = Counter/2
MPRSR Register
Slow-down control
Ratio < Fh?
Begin
End
Yes
MTIM Timer control over T
No
+1
-1
ST[3:0] Bits
MTIM Timer = 100h?
R-
R+
Zn < 55h?
4
ratio
Z Capture with MTIM Timer Underflow (Zn < 55h)
and register operation
2 MHz - 62.5 Hz
1 / 2Ratio
f
PERIPH
MDREG = MDREG x 2
1 / 2
MZREG = MZREG x 2
Counter = Counter x 2
MZPRV = MZPRV x 2
Ratio = Ratio - 1
Compute MCOMP
Tratio
ck
Speed-up control
Ratio > 0?
Begin
End
Yes
No