ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 75

• 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

ST72344xx ST72345xx
10.2.2
10.2.3
Note:
Each external interrupt vector is linked to a dedicated group of I/O port pins (see pinout
description and interrupt section). If several input pins are selected simultaneously as
interrupt sources, these are first detected according to the sensitivity bits in the EICR
register and then logically ORed.
The external interrupts are hardware interrupts, which means that the request latch (not
accessible directly by the application) is automatically cleared when the corresponding
interrupt vector is fetched. To clear an unwanted pending interrupt by software, the
sensitivity bits in the EICR register must be modified.
Output modes
The output configuration is selected by setting the corresponding DDR register bit. In this
case, writing the DR register applies this digital value to the I/O pin through the latch. Then
reading the DR register returns the previously stored value.
Two different output modes can be selected by software through the OR register: Output
push-pull and open-drain.
DR register value and output pin status:
Table 26.
Alternate functions
When an on-chip peripheral is configured to use a pin, the alternate function is automatically
selected. This alternate function takes priority over the standard I/O programming.
When the signal is coming from an on-chip peripheral, the I/O pin is automatically
configured in output mode (push-pull or open drain according to the peripheral).
When the signal is going to an on-chip peripheral, the I/O pin must be configured in input
mode. In this case, the pin state is also digitally readable by addressing the DR register.
Input pull-up configuration can cause unexpected value at the input of the alternate
peripheral input. When an on-chip peripheral use a pin as input and output, this pin has to
be configured in input floating mode.
DR
0
1
Output modes
Doc ID 12321 Rev 5
Push-pull
V
V
DD
SS
Open-drain
Floating
V
SS
I/O ports
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