H8SXSLASH1663 datasheet(995/1158 Pages) RENESAS

995 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 943 of 1102

REJ09B0294-0100

(4) Receive Data Check

The methods for checking of receive data are listed below.

1. Input frequency

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.

2. Multiplication ratio

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.

3. Operating frequency error

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

The calculated operating frequency should be checked to ensure that it is within the range of

minimum to maximum frequencies which are available with the clock modes of the specified

device. When it is out of this range, an operating frequency error is generated.

4. Bit rate

To facilitate error checking, the value (n) of clock select (CKS) in the serial mode register

(SMR), and the value (N) in the bit rate register (BRR), which are found from the peripheral

operating clock frequency (

φ) and bit rate (B), are used to calculate the error rate to ensure that

it is less than 4%. If the error is more than 4%, a bit rate error is generated. The error is

calculated using the following expression:

Error (%) = {[

]

− 1} × 100

(N + 1)

× B × 64 × 2(2×n − 1)

φ × 106

When the new bit rate is selectable, the rate will be set in the register after sending ACK in

response. The host will send an ACK with the new bit rate for confirmation and the boot program

will response with that rate.

Confirmation

H'06

• Confirmation, H'06, (one byte): Confirmation of a new bit rate

Response

H'06

• Response, H'06, (one byte): Response to confirmation of a new bit rate

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