ST10R172LT1 STMicroelectronics, ST10R172LT1 Datasheet - Page 39

• Manufacturer Part Number: ST10R172LT1
• Description: MCU 16BIT ROMLESS LV 100TQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10R172LT1

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, SSP, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 77
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 100-TQFP, 100-VQFP
• Controller Family/series: ST10
• No. Of I/o's: 77
• Ram Memory Size: 1KB
• Cpu Speed: 50MHz
• No. Of Timers: 5
• Embedded Interface Type: SPI, USART
• No. Of Pwm Channels: 1
• Rohs Compliant: Yes
• Processor Series: ST10R1x
• Core: ST10
• Data Bus Width: 16 bit
• Data Ram Size: 1 KB
• Interface Type: SSP, USART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 77
• Number Of Timers: 5
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: In Transition

Prescaler operation
Set when pins P0.15-13 (P0H.7-5) equal ’001’ during reset, the CPU clock is derived from the
internal oscillator (input clock signal) by a 2:1 prescaler.
The frequency of f
duration of an individual TCL) is defined by the period of the input clock f
The timings listed in the AC characteristics that refer to TCLs therefore can be calculated
using the period of f
Note that if the bit OWDDIS in SYSCON register is cleared, the PLL runs on its free-running
frequency and delivers the clock signal for the Oscillator Watchdog. If bit OWDDIS is set, then
the PLL is switched off.
Direct drive
When pins P0.15-13 (P0H.7-5) equal ’011’ during reset, the on-chip phase locked loop is
disabled and the CPU clock is driven from the internal oscillator with the input clock signal.
The frequency of f
(i.e. the duration of an individual TCL) is defined by the duty cycle of the input clock f
The TCL timing below must be calculated using the minimum possible TCL which can be
calculated by the formula:
For two consecutive TCLs the deviation caused by the duty cycle of f
the duration of 2TCL is always 1/f
only once for timings that require an odd number of TCLs (1,3,...). Timings that require an
even number of TCLs (2,4,...) may use the formula:
0
P0.15-13 (P0H.7-5)
1
0
0
0
1) The maximum depends on the duty cycle of the external clock signal. The maxi-
mum input frequency is 25 MHz when using an external crystal oscillator, but
higher frequencies can be applied with an external clock source.
0
0
1
1
0
0
CPU
0
1
0
1
CPU
XTAL
Table 12 CPU clock generation mechanisms
is half the frequency of f
directly follows the frequency of f
for any TCL.
CPU frequency
f
F
F
F
F
TCL
F
CPU
XTAL
XTAL
XTAL
XTAL
XTAL
min
= f
* 5
* 1
* 1.5
/ 2
* 2.5
XTAL
XTAL
=
1 f
. Therefore, the minimum value TCL
* F
XTAL
ST10R172L - ELECTRICAL CHARACTERISTICS
External clock
input range 10-
50MHz
2 to 10 MHz
1 to 50 MHz
6.66 to 33.33 MHz
2 to 100 MHz
4 to 20 MHz
XTAL
DC
min
and the high and low time of f
2TCL
DC
XTAL
=
=
so the high and low time of f
duty cycle
1 f
XTAL
Notes
Direct drive
CPU clock via 2:1 prescaler
XTAL
.
XTAL
is compensated so
min
1)
.
has to be used
CPU
XTAL
(i.e. the
CPU
39/68
.
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