MC9S08SH8CWJR Freescale Semiconductor, MC9S08SH8CWJR Datasheet - Page 191
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MC9S08SH8CWJR
Manufacturer Part Number
MC9S08SH8CWJR
Description
IC MCU 8BIT 8K FLASH 20WSOIC
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.MC9S08SH8CWJR.pdf
(338 pages)
Specifications of MC9S08SH8CWJR
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, LIN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
17
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SOIC (0.300", 7.50mm Width)
Processor Series
S08SH
Core
HCS08
Data Bus Width
8 bit
Interface Type
SPI, SCI, RS-232
Maximum Clock Frequency
5 MHz, 40 MHz
Number Of Programmable I/os
17
Number Of Timers
2
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMO9S08SG32, DEMO9S08SG32AUTO, DEMO9S08SG8, DEMO9S08SG8AUTO, DEMO9S08SH32, DEMO9S08SH8
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
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Chapter 12 Modulo Timer (S08MTIMV1)
12.4
Functional Description
The MTIM is composed of a main 8-bit up-counter with an 8-bit modulo register, a clock source selector,
and a prescaler block with nine selectable values. The module also contains software selectable interrupt
logic.
The MTIM counter (
CNT) has three modes of operation: stopped, free-running, and modulo. Out of
MTIM
reset, the counter is stopped. If the counter is started without writing a new value to the modulo register,
then the counter will be in free-running mode. The counter is in modulo mode when a value other than $00
is in the modulo register while the counter is running.
After any MCU reset, the counter is stopped and reset to $00, and the modulus is set to $00. The bus clock
is selected as the default clock source and the prescale value is divide by 1. To start the MTIM in
free-running mode, simply write to the MTIM status and control register (
SC) and clear the MTIM
MTIM
stop bit (TSTP).
Four clock sources are software selectable: the internal bus clock, the fixed frequency clock (XCLK), and
an external clock on the TCLK pin, selectable as incrementing on either rising or falling edges. The MTIM
clock select bits (CLKS1:CLKS0) in
SC are used to select the desired clock source. If the counter is
MTIM
active (TSTP = 0) when a new clock source is selected, the counter will continue counting from the
previous value using the new clock source.
Nine prescale values are software selectable: clock source divided by 1, 2, 4, 8, 16, 32, 64, 128, or 256.
The prescaler select bits (PS[3:0]) in
SC select the desired prescale value. If the counter is active
MTIM
(TSTP = 0) when a new prescaler value is selected, the counter will continue counting from the previous
value using the new prescaler value.
The MTIM modulo register (
MOD) allows the overflow compare value to be set to any value from
MTIM
$01 to $FF. Reset clears the modulo value to $00, which results in a free running counter.
When the counter is active (TSTP = 0), the counter increments at the selected rate until the count matches
the modulo value. When these values match, the counter overflows to $00 and continues counting. The
MTIM overflow flag (TOF) is set whenever the counter overflows. The flag sets on the transition from the
modulo value to $00. Writing to
MOD while the counter is active resets the counter to $00 and clears
MTIM
TOF.
SC register while TOF is set. The
Clearing TOF is a two-step process. The first step is to read the
MTIM
second step is to write a 0 to TOF. If another overflow occurs between the first and second steps, the
clearing process is reset and TOF will remain set after the second step is performed. This will prevent the
second occurrence from being missed. TOF is also cleared when a 1 is written to TRST or when any value
is written to the
MOD register.
MTIM
The MTIM allows for an optional interrupt to be generated whenever TOF is set. To enable the MTIM
overflow interrupt, set the MTIM overflow interrupt enable bit (TOIE) in
SC. TOIE should never be
MTIM
written to a 1 while TOF = 1. Instead, TOF should be cleared first, then the TOIE can be set to 1.
MC9S08SH8 MCU Series Data Sheet, Rev. 3
Freescale Semiconductor
191
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