h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 479

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

• Multiplication ratio 2 (one byte): The value of multiplication or division ratios for the
• SUM (one byte): Checksum
• Response, H'06, (one byte): Response to selection of a new bit rate
• Error response, H'BF, (one byte): Error response to selection of new bit rate
• ERROR: (one byte):
Received Data Check: The methods for checking of received data are listed below.
1. Input frequency
2. Multiplication ratio
3. Operating frequency error
Response
Error Response
peripheral frequency
Multiplication ratio (one byte): The value of the multiplication ratio (e.g. when the clock
frequency is multiplied by four, the multiplication ratio will be H'04.)
(Division ratio: The inverse of the division ratio, as a negative number (E.g. when the clock is
divided by two, the value of division ratio will be H'FE. H'FE = D'-2)
When it is possible to set the bit rate, the response will be ACK.
The received value of the input frequency is checked to ensure that it is within the range of
minimum to maximum frequencies which matches the clock modes of the specified device.
When the value is out of this range, an input-frequency error is generated.
The received value of the multiplication ratio or division ratio is checked to ensure that it
matches the clock modes of the specified device. When the value is out of this range, an input-
frequency error is generated.
Operating frequency is calculated from the received value of the input frequency and the
multiplication or division ratio. The input frequency is input to the LSI and the LSI is operated
at the operating frequency. The expression is given below.
Operating frequency = Input frequency × Multiplication ratio, or
Operating frequency = Input frequency ÷ Division ratio
H'06
H'11:
H'24:
H'25:
H'26:
H'27:
H'BF
Error code
Sum checking error
Bit-rate selection error
The rate is not available.
Error in input frequency
This input frequency is not within the specified range.
Multiplication-ratio error
The ratio does not match an available ratio.
Operating frequency error
The frequency is not within the specified range.
ERROR
Rev. 2.00, 03/04, page 447 of 534