ST72321BR9 STMicroelectronics, ST72321BR9 Datasheet - Page 165
ST72321BR9
Manufacturer Part Number
ST72321BR9
Description
8-bit MCU
Manufacturer
STMicroelectronics
Datasheet
1.ST72321BJ6.pdf
(187 pages)
Specifications of ST72321BR9
Hdflash Endurance
100 cycles, data retention
Clock Sources
crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
Four Power Saving Modes
Halt, Active-Halt, Wait and Slow
Main Clock Controller With
Real time base, Beep and Clock-out capabilities
Two 16-bit Timers With
2 input captures, 2 output compares, external clock input on one timer, PWM and pulse generator modes
8-bit Pwm Auto-reload Timer With
2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
- Current page: 165 of 187
- Download datasheet (3Mb)
COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d)
The following table gives the values to be written in
the I2CCCR register to obtain the required I
SCL line frequency.
Table 28. SCL Frequency Table
Legend:
R
f
NA = Not achievable
Note:
– For speeds around 200 kHz, achieved speed can have ±5% tolerance
– For other speed ranges, achieved speed can have ±2% tolerance
The above variations depend on the accuracy of the external components used.
SCL
P
= External pull-up resistance
(kHz)
f
400
300
200
100
= I
SCL
50
20
2
C speed
R
P
=3.3kΩ
5Fh
83h
10h
24h
NA
NA
V
DD
= 4.1 V
R
P
=4.7kΩ
83h
10h
24h
5Fh
NA
NA
f
CPU
=4 MHz.
R
ST72321BRx, ST72321BARx ST72321BJx, ST72321BKx
P
=3.3kΩ
5Fh
83h
10h
24h
NA
NA
V
DD
= 5 V
2
C
R
P
=4.7kΩ
83h
10h
24h
5Fh
NA
NA
I2CCCR Value
R
P
=3.3kΩ
4Ch
8Ah
FFh
83h
85h
24h
V
DD
= 4.1 V
R
P
=4.7kΩ
4Ch
FFh
85h
89h
23h
83
f
CPU
=8 MHz.
R
P
=3.3kΩ
8Ah
4Ch
FFh
83h
85h
24h
V
DD
= 5 V
R
P
165/187
=4.7kΩ
4Ch
8Ah
FFh
83h
85h
23h
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