PC87109VBE Nuvoton Technology Corporation of America, PC87109VBE Datasheet - Page 28

• Manufacturer Part Number: PC87109VBE
• Description: IC CONTROLLER ADV UART 32-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of PC87109VBE

• Features: Transmit Deferral
• Number Of Channels: 2, DUART
• Fifo's: 16 Byte
• Voltage - Supply: 5V
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *PC87109VBE

3.3.1 BGD - Baud Generator Divisor Port
This port provides the data path to the baud generator divisor register that holds the reload value for the baud generator counter.
programmed value must be such that the baud generator output clock frequency is sixteen times the desired baud rate value.
The baud generator divisor register is 16 bits wide and is split into two independently accessible 8-bit parts. Correspondingly,
the BGD port is also 16 bits wide and is split into two 8-bit parts, occupying consecutive address locations. BGDL is located at
the lower address and accesses the least significant part of the baud generator divisor register, whereas BGDH is located at the
higher address and accesses the most significant part. The baud generator divisor register must be loaded during initialization to
ensure proper operation of the baud generator. Upon loading either part of it, the baud generator counter is immediately loaded.
After reset, the content of the baud generator divisor register is indeterminate.
3.3.2 EXCR1 - Extended Control Register 1
Used to control the extended mode of operation.
Upon reset all bits are set to 0.
Divisor values from 1 to 2
Bits
Function
Reset State
BTEST
B7
0
Baud Rate
Prescaler
1500000
115200
230400
460800
750000
921600
14400
19200
28800
38400
57600
Value
134.5
1200
1800
2000
2400
3600
4800
7200
9600
110
150
300
600
16
50
75
- 1 can be used. See Table 3-8. The zero value is reserved and must not be used. The
res
B6
0
Divisor
2304
1536
1047
857
768
384
192
96
64
58
48
32
24
16
12
---
---
---
---
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8
6
4
3
2
1
Table 3-8. Baud Generator Divisor Settings
Figure 3-11. Extended Control Register 1
13
ETDLBK
% Error
B5
0.16%
0.16%
0.19%
0.10%
0.16%
0.16%
0.16%
0.16%
0.16%
0.53%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0
---
---
---
---
---
Divisor
LOOP
18461
12307
28
8391
6863
6153
3076
1538
769
512
461
384
256
192
128
B4
96
64
48
32
24
16
---
---
8
4
2
1
0
1.625
% Error
DMASWP
0.16%
0.16%
0.16%
0.00%
0.01%
0.01%
0.00%
0.01%
0.03%
0.03%
0.03%
0.16%
0.12%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
---
---
B3
0
Divisor
30000
20000
13636
11150
10000
5000
2500
1250
833
750
625
416
312
208
156
104
78
52
39
26
13
---
---
---
2
1
DMATH
B2
0
1
% Error
0.00%
0.00%
0.00%
0.02%
0.00%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.16%
0.00%
0.00%
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---
---
DMANF
B1
0
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EXT_SL
B0
0