ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 259

• Manufacturer Part Number: ST72521R9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72521R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

ST72521xx-Auto
Note:
Table 164. Option byte 1 bit description (continued)
Table 165. Package selection (OPT7)
On the chip, each I/O port has eight pads. Pads that are not bonded to external pins are in
input pull-up configuration after reset. The configuration of these pads must be kept at reset
state to avoid added current consumption.
Table 166. Oscillator frequency range selection (OPT3:1)
OPT5:4
OPT3:1 OSCRANGE[2:0]
OPT0
Bit
MP
MS
HS
Version
LP
(A)R
M
OSCTYPE[1:0]
Typical frequency range
PLLOFF
Name
8~16 MHz
1~2 MHz
2~4 MHz
4~8 MHz
Oscillator type
Oscillator range
PLL activation
Caution: The PLL can be enabled only if the “OSCRANGE” (OPT3:1)
bits are configured to “MP - 2~4 MHz”. Otherwise, the device
functionality is not guaranteed.
These option bits select the ST7 main clock source type.
00: Clock source = Resonator oscillator
01: Reserved
10: Clock source = Internal RC oscillator
11: Clock source = External source
When the resonator oscillator type is selected, these option bits select
the resonator oscillator current source corresponding to the frequency
range of the used resonator. Otherwise, these bits are used to select
the normal operating frequency range (see
frequency range selection
This option bit activates the PLL which allows multiplication by two of
the main input clock frequency. The PLL must not be used with the
internal RC oscillator or with external clock source. The PLL is
guaranteed only with an input frequency between 2 and 4 MHz.
0: PLL x2 enabled
1: PLL x2 disabled
Selected package
Doc ID 17660 Rev 1
LQFP80
LQFP64
Device configuration and ordering information
2
0
0
0
0
(OPT3:1)).
Function
OSCRANGE
PKG1
1
1
Table 166: Oscillator
1
0
0
1
1
PKG0
1
0
0
0
1
0
1
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