BMSKTOPASA900(DCE) Toshiba, BMSKTOPASA900(DCE) Datasheet - Page 389

• Manufacturer Part Number: BMSKTOPASA900(DCE)
• Description: KIT STARTER TMPA900 USB JTAG
• Manufacturer: Toshiba
• Series: TOPASr
• Type: MCUr

Specifications of BMSKTOPASA900(DCE)

• Contents: Evaluation Board, Cable(s), Software and Documentation
• For Use With/related Products: TMPA900CMXBG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical baud rate setting examples
f
f
UARTCLK
UARTCLK
divisor (integer)
divisor (integer)
= 100 MHz
= 96 MHz
Programmed
Programmed
0xDDF2
0xD511
0x1458
0x1388
0xA2C
0x1B2
0x28B
0x1A0
0x9C4
0x145
0x138
0x271
0x1B
0x6C
0xA2
0x1A
0x4E
0x9C
0x36
0x51
0x34
0x68
0xD
0xD
0x1
0x1
Example: Calculating the divisor value
When the required baud rate is 230400 and f
Baud rate divisor = (4 × 10
Therefore, BRDI = 1 and BRDF = 0.085
Fractional part is ((0.085 × 64) + 0.5) = 5.94.
Generated baud rate divisor = 1 + 5/64 = 1.078
Generated baud rate = (4 × 10
Error = (231911 − 230400)/ 230400 × 100 = 0.656 %
The maximum error using a 6-bit UARTxFBRD register = 1/64 × 100 = 1.56 %
This error occurs when m = 1, and it is cumulative over 64 clock ticks.
divisor (fraction)
divisor (fraction)
Programmed
Programmed
0x1D
0x24
0x10
0x18
0x20
0x31
0x21
0x15
0x10
0x20
0x2B
0xB
0xC
0xB
0x1
0x8
0x2
0x3
0x1
0x1
0x3
0x5
0x8
0x1
0x1
0x1
The integer part of this, 0x5, should be set as the fractional baud
rate divisor value.
TENTATIVE
TMPA900CM- 388
Required bit rate
Required bit rate
6
)/ (16 × 230400) = 1.085
460800
230400
115200
460800
230400
115200
(bps)
(bps)
76800
57600
38400
19200
14400
76800
57600
38400
19200
14400
6
9600
2400
1200
9600
2400
1200
110
110
)/ (16 × 1.078) = 231911
─
─
6153846 (fastest)
5907692 (fastest)
Generated bit
Generated bit
UARTCLK
rate (bps)
rate (bps)
460829.493
230414.747
115207.373
460984.394
230353.929
115211.521
76804.916
57603.687
38398.771
19200.307
14399.885
109.99999
76800.000
57597.120
38400.000
19200.000
14399.820
9599.923
2399.995
1200.001
9599.760
2399.985
1199.996
110.000
= 4 MHz:
Error (%)
Error (%)
-1.00E-05
2.60E-06
-0.0032
-0.0008
-0.0008
-0.0002
-0.0200
-0.0050
-0.0012
-0.0025
-0.0006
-0.0003
0.0064
0.0064
0.0064
0.0064
0.0064
0.0016
0.0001
0.0400
0.0100
─
─
0
0
0
TMPA900CM
2009-10-14