ST72345C4 STMicroelectronics, ST72345C4 Datasheet - Page 234

• Manufacturer Part Number: ST72345C4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72345C4

• 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

Device configuration and ordering information
Note:
15.1.3
Note:
234/247
Table 121. Selection of the resonator oscillator range
OPT3 = OSC RC Oscillator selection
OPT2 = DIV2EN PLL Divide by 2 enable
DIV2EN must be kept disabled when PLLx4 is enabled.
OPT1 = PLLx4x8 PLL Factor selection
OPT0 = PLLOFF PLL disable
These option bits must be configured as described in
range and the expected CPU frequency
Table 122. List of valid option combinations
1. For a target ratio of x4 between 3.3V - 3.65V, this is the recommended configuration.
Option byte 2
OPT7:0 = Reserved. Must be kept at 1.
Typical frequency range
with Resonator
Reserved
External clock
x4
x4
x8
Target ratio
(1)
0: RC oscillator on
1: RC oscillator off
0: PLL division by 2 enabled
1: PLL division by 2 disabled
0: PLLx4
1: PLLx8
0: PLL enabled
1: PLL disabled (by-passed)
2.7 V - 3.65 V
3.3 V - 5.5 V
LP
MP
MS
HS
V
DD
Doc ID 12321 Rev 5
8~16 MHz
1~2 MHz
2~4 MHz
4~8 MHz
x
0
1
DIV2 EN
Table 122
2
0
0
0
0
1
1
1
1
0
0
0
Option bits
PLL OFF
depending on the voltage
OSCRANGE
ST72344xx ST72345xx
1
0
0
1
1
0
0
1
1
0
1
1
PLL x4x8
0
0
1
0
1
0
1
0
1