ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 240

• 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

Known limitations
240/247
LD A,PFDR
AND A,#02
LD Y,A; store the level after writing to PxOR/PxDDR
LD A,X; check for falling edge
cp A,#02
jrne OUT
TNZ Y
jrne OUT
LD A,sema; check the semaphore status if edge is detected
CP A,#01
jrne OUT
call call_routine; call the interrupt routine
OUT:LD A,#00
LD sema,A
.call_routine; entry to call_routine
PUSH A
PUSH X
PUSH CC
.ext1_rt; entry to interrupt routine
LD A,#00
LD sema,A
IRET
Case 2: Writing to PxOR or PxDDR with global interrupts disabled:
SIM; set the interrupt mask
LD A,PFDR
AND A,#$02
LD
LD A,#$90
LD PFDDR,A; Write into PFDDR
LD A,#$ff
LD PFOR,A; Write to PFOR
LD A,PFDR
AND A,#$02
LD Y,A; store the level after writing to PxOR/PxDDR
LD A,X; check for falling edge
X,A; store the level before writing to PxOR/PxDDR
Doc ID 12321 Rev 5
ST72344xx ST72345xx