ST72F521AR9TC STMicroelectronics, ST72F521AR9TC Datasheet - Page 213

• Manufacturer Part Number: ST72F521AR9TC
• Description: IC MCU 8BIT 60K FLASH 64-TQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F521AR9TC

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: CAN, I²C, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 48
• Program Memory Size: 60KB (60K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 64-TQFP, 64-VQFP
• For Use With: 497-6453 - BOARD EVAL BASED ON ST7LNBX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

KNOWN LIMITATIONS (Cont’d)
15.2 ALL FLASH DEVICES
15.2.1 Internal RC Oscillator with LVD
The internal RC can only be used if LVD is ena-
bled.
15.2.2 I/O behaviour during ICC mode entry
sequence
Symptom
In 80-pin devices (Flash), both Port G and H are
forced to output push-pull during ICC mode entry
sequence. 80-pin ROM devices are not impacted
by this issue.
Details
To enable programming of all flash sectors, the
device must leave USER mode and be configured
in ICC mode. Once in ICC mode, the ICC protocol
enables an ST7 microcontroller to communicate
with an external controller (such as a PC). ICC
mode is entered by applying 39 pulses on the IC-
CDATA signal during reset. To enter ICC mode,
the device goes through other modes, some
modes are critical because the I/Os PG[7:0] and
PH[7:0] are forced to output push-pull.
Impact on the Application
The PG and PH I/O ports are forced to output
push-pull during three pulses on ICCDATA. In cer-
tain circumstances, this behaviour can lead to a
short-circuit between the I/O signals and V
or an output signal of another application compo-
nent.
In addition, switching these I/Os to output mode
can cause the application to leave reset state, dis-
turbing the ICC communication and preventing the
user from programming the flash.
15.2.3 Read-out protection with LVD
The LVD is not supported if Readout protection is
enabled.
ST72F521, ST72521B
DD
213/215
, V
SS