tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 365
tmpr4937
Manufacturer Part Number
tmpr4937
Description
64-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMPR4937.pdf
(552 pages)
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IMBUSCLK
11.3.3
SCLK
Serial Clock Generator
frequency that is 16× the baud rate. One of the following can be selected as the source for the Serial
Clock (SIOCLK).
frequency of the CPU clock. The maximum frequency tolerance of the external clock input (SCLK) is
45% the frequency of IMBUSCLK. For example, if IMBUSCLK = 60 MHz, then set SCLK to 27 MHz
or less.
formula.
% of the target baud rate (communication baud rate).
SILCR. SCS [1]
Select SIOCLK
Generates the Serial Clock (SIOCLK). SIOCLK determines the serial transfer rate and has a
The IMBUSCLK frequency can be selected from frequencies that are 1/2, 1/2.5, 1/3, or 1/4 the
The baud rate generator is a circuit that divides these clock signals according to the following
Table 11.3.1 shows example settings of divide values relative to representative baud rates.
It is possible to correctly receive data if the error of the baud rate set by this controller is within 3.12
•
•
•
Selector
Baud
Internal System Clock (IMBUSCLK)
External Clock Input (SCLK)
Baud rate generator circuit output
•
•
•
Figure 11.3.2 Baud Rate Generator and SIOCLK Generator
Rate
fc: Clock frequency of IMBUSCLK or an external clock input (SCLK)
Prescalar Value: 2, 8, 32, 128
Divide Value: 1, 2, 3,…255
fc
=
Prescalar
Prescalar
×
1/128
1/32
fc
1/2
1/8
Divisor
T0
T2
T4
T6
×
Baud Rate Generator
16
SIBGR. BCLK
11-5
Select CLK
Selector
Chapter 11 Serial I/O Port
SIBGR. BRD
Divide value
1/1 − 1/255
Baud Rate
Divider
SILCR. SCS [0]
Select SIOCLK
Selector
SIOCLK
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