UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 215

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

Therefore, the maximum receivable baud rate at the transmission source is as follows.
Similarly, the maximum permissible data frame length can be calculated as follows.
Therefore, the minimum receivable baud rate at the transmission source is as follows.
The permissible baud rate error between UART6 and the transmission source can be calculated from the above
minimum and maximum baud rate expressions, as follows.
Remarks 1. The permissible error of reception depends on the number of bits in one frame, input clock
10
11
8
20
50
100
255
Minimum permissible data frame length: FLmin = 11 × FL −
× FLmax = 11 × FL −
Division Ratio (k)
FLmax =
BRmax = (FLmin/11)
BRmin = (FLmax/11)
2. k: Set value of BRGC6
frequency, and division ratio (k). The higher the input clock frequency and the higher the division
ratio (k), the higher the permissible error.
21k – 2
20k
Table 11-5. Maximum/Minimum Permissible Baud Rate Error
FL × 11
k + 2
2 × k
Maximum Permissible Baud Rate Error
−
−
× FL =
1
1
CHAPTER 11 SERIAL INTERFACE UART6
=
=
21k + 2
21k − 2
22k
20k
21k − 2
+3.53%
+4.26%
+4.56%
+4.66%
+4.72%
2 × k
User’s Manual U16898EJ5V0UD
Brate
Brate
FL
k − 2
2k
× FL =
Minimum Permissible Baud Rate Error
21k + 2
2k
−3.61%
−4.31%
−4.58%
−4.67%
−4.73%
FL
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