ST72324BK2 STMicroelectronics, ST72324BK2 Datasheet - Page 116
ST72324BK2
Manufacturer Part Number
ST72324BK2
Description
5V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
Manufacturer
STMicroelectronics
Datasheet
1.ST72324BJ6.pdf
(193 pages)
Specifications of ST72324BK2
Hdflash Endurance
1 kcycle at 55 °C, data retention 40 years at 85 °C
Clock Sources
crystal/ceramic resonator oscillators, int. RC osc. and ext. clock input
4 Power Saving Modes
Slow, Wait, Active-halt, and Halt
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Conventional baud rate generation
The baud rate for the receiver and transmitter (Rx and Tx) are set independently and
calculated as follows:
with:
PR = 1, 3, 4 or 13 (see SCP[1:0] bits)
TR = 1, 2, 4, 8, 16, 32, 64,128
(see SCT[2:0] bits)
RR = 1, 2, 4, 8, 16, 32, 64,128
(see SCR[2:0] bits)
All these bits are in the
Example: If f
receive baud rates are 38400 baud.
The baud rate registers MUST NOT be changed while the transmitter or the receiver is
enabled.
Extended baud rate generation
The extended prescaler option gives a very fine tuning on the baud rate, using a 255 value
prescaler, whereas the conventional baud rate generator retains industry standard software
compatibility.
The extended baud rate generator block diagram is described in
The output clock rate sent to the transmitter or to the receiver will be the output from the 16
divider divided by a factor ranging from 1 to 255 set in the SCIERPR or the SCIETPR
register.
The extended prescaler is activated by setting the SCIETPR or SCIERPR register to a value
other than zero. The baud rates are calculated as follows:
with:
ETPR = 1,..,255, see
page 126.
ERPR = 1,.. 255, see
page
125.
CPU
is 8 MHz (normal mode) and if PR = 13 and TR = RR = 1, the transmit and
SCI extended transmit prescaler division register (SCIETPR) on
SCI extended receive prescaler division register (SCIERPR) on
SCI baud rate register (SCIBRR) on page
Tx =
Tx =
16
(16
*
ETPR*(PR*TR)
f
CPU
*
f
PR)
CPU
*
TR
Rx =
Rx =
16
*
ERPR*(PR*RR)
(16
f
CPU
f
*
CPU
PR)
*
RR
Figure
125.
59.
ST72324Bxx
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