MCHC908JW32FC Freescale Semiconductor, MCHC908JW32FC Datasheet - Page 112
![IC MCU 32K FLASH 8MHZ 48-QFN](/photos/12/17/121792/mchc908jw32fc_sml.jpg)
MCHC908JW32FC
Manufacturer Part Number
MCHC908JW32FC
Description
IC MCU 32K FLASH 8MHZ 48-QFN
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.RD3152MMA7260Q.pdf
(232 pages)
Specifications of MCHC908JW32FC
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SPI, USB
Peripherals
LED, LVD, POR, PWM
Number Of I /o
29
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
3.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
48-QFN
Controller Family/series
HC08
No. Of I/o's
29
Ram Memory Size
1KB
Cpu Speed
8MHz
No. Of Timers
1
Embedded Interface Type
SPI, USB
Rohs Compliant
Yes
Processor Series
HC08JW
Core
HC08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SPI, USB
Number Of Programmable I/os
29
Number Of Timers
2
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Development Tools By Supplier
FSICEBASE, DEMO908GZ60E, M68EML08GZE, KITUSBSPIDGLEVME, KITUSBSPIEVME, KIT33810EKEVME
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
- Current page: 112 of 232
- Download datasheet (3Mb)
Timer Interface Module (TIM)
Use the following methods to synchronize unbuffered changes in the PWM pulse width on channel x:
8.4.4.2 Buffered PWM Signal Generation
Channels 0 and 1 can be linked to form a buffered PWM channel whose output appears on the TCH0 pin.
The TIM channel registers of the linked pair alternately control the pulse width of the output.
Setting the MS0B bit in TIM channel 0 status and control register (TSC0) links channel 0 and channel 1.
The TIM channel 0 registers initially control the pulse width on the TCH0 pin. Writing to the TIM channel
1 registers enables the TIM channel 1 registers to synchronously control the pulse width at the beginning
of the next PWM period. At each subsequent overflow, the TIM channel registers (0 or 1) that control the
pulse width are the ones written to last. TSC0 controls and monitors the buffered PWM function, and TIM
channel 1 status and control register (TSC1) is unused. While the MS0B bit is set, the channel 1 pin,
TCH1, is available as a general-purpose I/O pin.
8.4.4.3 PWM Initialization
To ensure correct operation when generating unbuffered or buffered PWM signals, use the following
initialization procedure:
112
1. In the TIM status and control register (TSC):
2. In the TIM counter modulo registers (TMODH:TMODL), write the value for the required PWM
3. In the TIM channel x registers (TCHxH:TCHxL), write the value for the required pulse width.
•
•
When changing to a shorter pulse width, enable channel x output compare interrupts and write the
new value in the output compare interrupt routine. The output compare interrupt occurs at the end
of the current pulse. The interrupt routine has until the end of the PWM period to write the new
value.
When changing to a longer pulse width, enable TIM overflow interrupts and write the new value in
the TIM overflow interrupt routine. The TIM overflow interrupt occurs at the end of the current PWM
period. Writing a larger value in an output compare interrupt routine (at the end of the current pulse)
could cause two output compares to occur in the same PWM period.
period.
a. Stop the TIM counter by setting the TIM stop bit, TSTOP.
b. Reset the TIM counter and prescaler by setting the TIM reset bit, TRST.
In PWM signal generation, do not program the PWM channel to toggle on
output compare. Toggling on output compare prevents reliable 0% duty
cycle generation and removes the ability of the channel to self-correct in the
event of software error or noise. Toggling on output compare also can
cause incorrect PWM signal generation when changing the PWM pulse
width to a new, much larger value.
In buffered PWM signal generation, do not write new pulse width values to
the currently active channel registers. User software should track the
currently active channel to prevent writing a new value to the active
channel. Writing to the active channel registers is the same as generating
unbuffered PWM signals.
MC68HC908JW32 Data Sheet, Rev. 6
NOTE
NOTE
Freescale Semiconductor
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