MC9S08SH16CTL Freescale, MC9S08SH16CTL Datasheet - Page 258
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MC9S08SH16CTL
Manufacturer Part Number
MC9S08SH16CTL
Description
Manufacturer
Freescale
Datasheet
1.MC9S08SH16CTL.pdf
(328 pages)
Specifications of MC9S08SH16CTL
Cpu Family
HCS08
Device Core Size
8b
Frequency (max)
40MHz
Interface Type
SCI/SPI
Total Internal Ram Size
1KB
# I/os (max)
23
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
16-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
28
Package Type
TSSOP
Program Memory Type
Flash
Program Memory Size
16KB
Lead Free Status / RoHS Status
Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
MC9S08SH16CTL
Manufacturer:
Freescale Semiconductor
Quantity:
135
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Chapter 16 Timer/PWM Module (S08TPMV3)
In output compare mode, values are transferred to the corresponding timer channel registers only after both
8-bit halves of a 16-bit register have been written and according to the value of CLKSB:CLKSA bits, so:
The coherency sequence can be manually reset by writing to the channel status/control register
(TPMxCnSC).
An output compare event sets a flag bit (CHnF) which may optionally generate a CPU-interrupt request.
16.4.2.3
This type of PWM output uses the normal up-counting mode of the timer counter (CPWMS=0) and can
be used when other channels in the same TPM are configured for input capture or output compare
functions. The period of this PWM signal is determined by the value of the modulus register
(TPMxMODH:TPMxMODL) plus 1. The duty cycle is determined by the setting in the timer channel
register (TPMxCnVH:TPMxCnVL). The polarity of this PWM signal is determined by the setting in the
ELSnA control bit. 0% and 100% duty cycle cases are possible.
The output compare value in the TPM channel registers determines the pulse width (duty cycle) of the
PWM signal
width. If ELSnA=0, the counter overflow forces the PWM signal high, and the output compare forces the
PWM signal low. If ELSnA=1, the counter overflow forces the PWM signal low, and the output compare
forces the PWM signal high.
When the channel value register is set to 0x0000, the duty cycle is 0%. 100% duty cycle can be achieved
by setting the timer-channel register (TPMxCnVH:TPMxCnVL) to a value greater than the modulus
setting. This implies that the modulus setting must be less than 0xFFFF in order to get 100% duty cycle.
Because the TPM may be used in an 8-bit MCU, the settings in the timer channel registers are buffered to
ensure coherent 16-bit updates and to avoid unexpected PWM pulse widths. Writes to any of the registers
TPMxCnVH and TPMxCnVL, actually write to buffer registers. In edge-aligned PWM mode, values are
transferred to the corresponding timer-channel registers according to the value of CLKSB:CLKSA bits, so:
258
•
•
•
•
If (CLKSB:CLKSA = 0:0), the registers are updated when the second byte is written
If (CLKSB:CLKSA not = 0:0), the registers are updated at the next change of the TPM counter
(end of the prescaler counting) after the second byte is written.
If (CLKSB:CLKSA = 0:0), the registers are updated when the second byte is written
If (CLKSB:CLKSA not = 0:0), the registers are updated after the both bytes were written, and the
TPM counter changes from (TPMxMODH:TPMxMODL - 1) to (TPMxMODH:TPMxMODL). If
(Figure
TPMxCHn
Edge-Aligned PWM Mode
OVERFLOW
16-15). The time between the modulus overflow and the output compare is the pulse
Figure 16-15. PWM Period and Pulse Width (ELSnA=0)
PULSE
WIDTH
PERIOD
MC9S08SH32 Series Data Sheet, Rev. 2
COMPARE
OUTPUT
OVERFLOW
PRELIMINARY
COMPARE
OUTPUT
OVERFLOW
COMPARE
OUTPUT
Freescale Semiconductor
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