ST62T03CM6 STMicroelectronics, ST62T03CM6 Datasheet - Page 46

IC MCU 8BIT W/ADC 16-SOP

ST62T03CM6

Manufacturer Part Number
ST62T03CM6
Description
IC MCU 8BIT W/ADC 16-SOP
Manufacturer
STMicroelectronics
Series
ST6r
Datasheet

Specifications of ST62T03CM6

Core Processor
ST6
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, WDT
Number Of I /o
9
Program Memory Size
1KB (1K x 8)
Program Memory Type
OTP
Ram Size
64 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
16-SOIC (0.300", 7.5mm Width)
Controller Family/series
ST6
No. Of I/o's
9
Ram Memory Size
64Byte
Cpu Speed
8MHz
No. Of Timers
2
Rohs Compliant
Yes
Processor Series
ST62T0x
Core
ST6
Data Bus Width
8 bit
Data Ram Size
64 B
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
9
Number Of Timers
2
Operating Supply Voltage
3 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Development Tools By Supplier
ST622XC-KIT/110, ST62GP-EMU2, ST62E2XC-EPB/110, ST62E6XC-EPB/US, STREALIZER-II
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / Rohs Status
In Transition
Other names
497-8233
ST62T03CM6

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ST6200C ST6201C ST6203C
8-BIT TIMER (Cont’d)
8.2.3 Counter/Prescaler Description
Prescaler
The prescaler input is the internal frequency f
divided by 12. The prescaler decrements on the
rising edge, depending on the division factor pro-
grammed by the PS[2:0] bits in the TSCR register.
The state of the 7-bit prescaler can be read in the
PSCR register.
When the prescaler reaches 0, it is automatically
reloaded with 7Fh.
Counter
The free running 8-bit downcounter is fed by the
output of the programmable prescaler, and is dec-
remented on every rising edge of the f
clock signal coming from the prescaler.
It is possible to read or write the contents of the
counter on the fly, by reading or writing the timer
counter register (TCR).
When the downcounter reaches 0, it is automati-
cally reloaded with the value 0FFh.
Counter Clock and Prescaler
The counter clock frequency is given by:
where f
The timer input clock feeds the 7-bit programma-
ble prescaler. The prescaler output can be pro-
grammed by selecting one of the 8 available pres-
caler taps using the PS[2:0] bits in the Status/Con-
trol Register (TSCR). Thus the division factor of
the prescaler can be set to 2
7). See
The clock input is enabled by the PSI (Prescaler
Initialize) bit in the TSCR register. When PSI is re-
set, the counter is frozen and the prescaler is load-
ed with the value 7Fh. When PSI is set, the pres-
caler and the counter run at the rate of the select-
ed clock source.
Counter and Prescaler Initialization
After RESET, the counter and the prescaler are in-
itialized to 0FFh and 7Fh respectively.
The 7-bit prescaler can be initialized to 7Fh by
clearing the PSI bit. Direct write access to the
46/100
1
– f
INT
PRESCALER
/12
Figure
f
COUNTER
27.
= f
is:
PRESCALER
n
(where n equals 0, to
/ 2
PS[2:0]
COUNTER
Doc ID 4563 Rev 5
INT
prescaler is also possible when PSI =1. Then, any
value between 0 and 7Fh can be loaded into it.
The 8-bit counter can be initialized separately by
writing to the TCR register.
8.2.3.1 8-bit Counting and Interrupt Capability
on Counter Underflow
Whatever the division factor defined for the pres-
caler, the Timer Counter works as an 8-bit down-
counter. The input clock frequency is user selecta-
ble using the PS[2:0] bits.
When the downcounter decrements to zero, the
TMZ (Timer Zero) bit in the TSCR is set. If the ETI
(Enable Timer Interrupt) bit in the TSCR is also
set, an interrupt request is generated.
The Timer interrupt can be used to exit the MCU
from WAIT or STOP mode.
The TCR can be written at any time by software to
define a time period ending with an underflow
event, and therefore manage delay or timer func-
tions.
TMZ is set when the downcounter reaches zero;
however, it may also be set by writing 00h in the
TCR register or by setting bit 7 of the TSCR register.
The TMZ bit must be cleared by user software
when servicing the timer interrupt to avoid unde-
sired interrupts when leaving the interrupt service
routine.
Note: A write to the TCR register will predominate
over the 8-bit counter decrement to 00h function,
i.e. if a write and a TCR register decrement to 00h
occur simultaneously, the write will take prece-
dence, and the TMZ bit is not set until the 8-bit
counter underflows again.
8.2.4 Low Power Modes
8.2.5 Interrupts
Interrupt Event
WAIT
STOP
Timer Zero
Event
Mode
No effect on timer.
Timer interrupt events cause the device to
exit from WAIT mode.
Timer registers are frozen.
Event
Flag
TMZ
Description
Enable
ETI
Bit
from
Wait
Exit
Yes
from
Stop
Exit
No

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