ST72F621L4M1 STMicroelectronics, ST72F621L4M1 Datasheet - Page 135

• Manufacturer Part Number: ST72F621L4M1
• Description: IC MCU 8BIT LS 16K 34-SOIC
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F621L4M1

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 34-SOIC (7.5mm Width)
• Processor Series: ST72F6x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: SCI, SPI, USB
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 2
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• On-chip Adc: 10 bit
• For Use With: 497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: In Transition
• Other names: 497-2112-5

15 IMPORTANT NOTES
Refer to
codes for each of the recent silicon revisions.
Silicon revisions are identifiable:
– on the device package, by the last letter of the
– on the box, by the last 3 digits of the Internal
See also
15.1 A/ D CONVERTER ACCURACY FOR FIRST
CONVERSION
Description
When the ADC is enabled after being powered
down (for example when waking up from HALT,
ACTIVE-HALT or setting the ADON bit in the AD-
CCSR register), the first conversion (8-bit or 10-
bit) accuracy does not meet the accuracy specified
in the datasheet.
Workaround
In order to have the accuracy specified in the
datasheet, the first conversion after a ADC switch-
on has to be ignored.
Note:
This limitation does not apply to Flash silicon rev.
G devices (see
15.2 A/D CONVERTER CONVERSION SPEED
Description
Following a change in the fabrication location, the
typical ADC conversion speed value for Flash de-
vices has improved from a previous value of 28µs
to 4µs.
Trace Code marked on the device package.
Sales Type printed in the box label.
Table 32
Figure 92. on page 137
Table
which provides a list of the trace
32).
Doc ID 6996 Rev 5
Table 32. Device Identification
When migrating software from Rev X to Rev G de-
vices (refer to
when using ADC interrupts.
Workaround
Firstly, on Rev G devices, only the use of One-
Shot conversion mode is recommended in con-
nection with ADC interrupts.
In Continuous Conversion mode, to avoid getting
trapped in a continuous interrupt, the ADC inter-
rupt routine must always have sufficient time to ex-
ecute completely before the next ADC conversion
interrupt, especially if the ADC interrupt is disabled
outside of this routine. With the shorter conversion
speed value, the interrupt may not be serviced fast
enough. For this reason, on Rev G devices, the
Continuous Conversion mode is not recommend-
ed in connection with ADC interrupts.
Secondly, in the interests of keeping code portable
between all Flash/ROM versions, using the ADC
as a source of a delayed trigger event is not ad-
vised. However, in such a scenario, a delay loop
should be inserted for Rev G Flash devices to en-
sure that the timing remains the same for any such
ADC delayed trigger events.
Flash Devices (Rev G)
(Latest Flash silicon)
Flash Devices (Rev X)
(Previous Flash silicon)
ROM Devices (Rev Z)
(Silicon Rev.)
Device Type
Table
Trace Code marked on device/
Internal Sales Type on box
label
“xxxxxxxxxG” / 72F62xxxxx$x4
“xxxxxxxxxX” / 72F62xxxxx$x8
“xxxxxxxxxX” / 72F62xxxxx$x9
“xxxxxxxxxZ” / 7262xxxxx$x2
“xxxxxxxxxZ” / 7262xxxxx$x3
32) care should be taken
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