ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 78

• Manufacturer Part Number: ST72344S4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72344S4

• Up To 16 Kbytes Program Memory: single voltage extended Flash (XFlash) with readout and write protection, in-circuit and inapplication programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
• 256 Bytes Data Eeprom With Readout Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: crystal/ceramic resonator oscillators, high-accuracy internal RC oscillator or external clock
• 5 Power-saving Modes: Slow, Wait, Halt, Auto-wakeup from Halt and Active-halt
• 16-bit Timer A With: 1 input capture, 1 output compares, external clock input, PWM and pulse generator modes
• 16-bit Timer B With: 2 input captures, 2 output compares, PWM and pulse generator modes

I/O ports
10.3
10.4
10.5
78/247
It is recommended not to change the voltage level or loading on any port pin while
conversion is in progress. Furthermore it is recommended not to have clocking pins located
close to a selected analog pin.
I/O port implementation
The hardware implementation on each I/O port depends on the settings in the DDR and OR
registers and specific feature of the I/O port such as ADC Input or true open drain.
Switching these I/O ports from one state to another should be done in a sequence that
prevents unwanted side effects. Recommended safe transitions are illustrated in
on page 78.
likely to present unwanted side-effects such as spurious interrupt generation.
Figure 36. Interrupt I/O port state transitions
Low-power modes
Table 29.
Interrupts
The external interrupt event generates an interrupt if the corresponding configuration is
selected with DDR and OR registers and the interrupt mask in the CC register is not active
(RIM instruction).
Table 30.
Wait
Halt
External interrupt on selected
external event
Mode
Warning:
Interrupt event
Other transitions are potentially risky and should be avoided, since they are
Description
Description of interrupt events
No effect on I/O ports. External interrupts cause the device to exit from Wait mode.
No effect on I/O ports. External interrupts cause the device to exit from Halt mode.
The analog input voltage level must be within the limits
stated in the absolute maximum ratings.
floating/pull-up
interrupt
INPUT
01
Doc ID 12321 Rev 5
(reset state)
Event flag
floating
INPUT
00
-
Description
open-drain
OUTPUT
Control bit
10
XX
Enable
DDRx
ORx
= DDR, OR
OUTPUT
push-pull
11
Exit from
ST72344xx ST72345xx
Wait
Yes
Exit from
Figure 36
Halt