ST10F280 STMicroelectronics, ST10F280 Datasheet - Page 66

• Manufacturer Part Number: ST10F280
• Description: MCU 16BIT 512K FLASH MAC 208-PBG
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F280

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: ASC, CAN, EBI/EMI, SSC
• Peripherals: POR, PWM, WDT
• Number Of I /o: 143
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 18K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 32x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 208-PBGA
• Processor Series: ST10F28x
• Core: ST10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

ST10F280
11.2.2 - XPWM Module Registers
The XPWM module is controlled via two sets of
registers. The waveforms are selected by the
channel specific registers XPTx (timer), XPPx
(period) and XPWx (pulse width).
Three common registers control the operating
modes and the general functions (XPWMCON0
and XPWMCON1) of the PWM module as well as
the interrupt behavior (XP2IC).
Up/Down Counters XPTx
Each counter XPTx of a PWM channel is clocked
either directly by the CPU clock or by the CPU
clock divided by 64. Bit PTIx in register
XPWMCON0 selects the respective clock source.
A XPWM counter counts up or down (controlled
by hardware), while its respective run control bit
PTRx is set. A timer is started (PTRx = ’1’) via
software and is stopped (PTRx = ’0’) either via
hardware or software, depending on its operating
mode. Control bit PTRx enables or disables the
clock input of counter XPTx rather than controlling
the XPWM output signal.
Note
Table 15 summarizes the XPWM frequencies that
result from various combinations of operating
mode, counter resolution (input clock) and pulse
width resolution.
Period Registers XPPx
The 16-bit period register XPPx of a XPWM chan-
nel determines the period of a PWM cycle, i.e. the
frequency of the PWM signal. This register is buff-
ered with a shadow register. The shadow register
is loaded from the respective XPPx register at the
beginning of every new PWM cycle, or upon a
write access to XPPx, while the timer is stopped.
The CPU accesses the XPPx register while the
hardware compares the contents of the shadow
register with the contents of the associated
counter XPTx. When a match is found between
counter and XPPx shadow register, the counter is
Table 15 : XPWM Frequency
66/186
CPU Clock/64
CPU Clock/64
CPU Clock/1
CPU Clock/1
For the register locations please refer to
the Table 14.
Mode 0
Mode 1
Resolution
Resolution
1.6 s
1.6 s
25ns
25ns
156.25kHz
78.12kHz
1.22kHz
2.44Hz
8-bit
8-bit
39.06kHz
610.35Hz
19.53kHz
305.17Hz
10-bit
10-bit
either reset to 0000h, or the count direction is
switched from counting up to counting down,
depending on the selected operating mode of that
XPWM channel. For the register locations refer to
the Table 14.
Pulse Width Registers XPWx
This 16-bit register holds the actual PWM pulse
width value which corresponds to the duty cycle of
the PWM signal. This register is buffered with a
shadow register. The CPU accesses the XPWx
register while the hardware compares the con-
tents of the shadow register with the contents of
the associated counter XPTx. The shadow regis-
ter is loaded from the respective XPWx register at
the beginning of every new PWM cycle, or upon a
write access to XPWx, while the timer is
stopped.When the counter value is greater than or
equal to the shadow register value, the PWM sig-
nal is set, otherwise it is reset. The output of the
comparators may be described by the boolean
formula:
PWM output signal = [XPTx] [XPWx shadow latch].
This type of comparison allows a flexible control of
the PWM signal. For the register locations refer to
theTable 14.
Table 14 : XPWM Module Channel Specific
Register Addresses
Register
These registers are not
XPW0
XPW1
XPW2
XPW3
bit-addressable.
152.58Hz
9.77kHz
4.88kHz
76.29Hz
12-bit
12-bit
Address
EC30h
EC32h
EC34h
EC36h
38.15Hz
1.22kHz
19.07Hz
2.44Hz
14-bit
14-bit
Register
XPT0
XPT1
XPT2
XPT3
XPP0
XPP1
XPP2
XPP3
610.35Hz
305.17Hz
Address
9.54Hz
4.77Hz
16-bit
16-bit
EC10h
EC12h
EC14h
EC16h
EC20h
EC22h
EC24h
EC26h