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Automatic SCI Bit Rate Adjustment

Low period (9 bits) measured (H'00 data)

(1 or more bits)

Figure 17.17 Measurement of Low Period of Host Transmission Data

When boot mode is initiated, the H8S/2345 MCU measures the low period of the asynchronous

SCI communication data (H'00) transmitted continuously from the host, see figure 17.17. The SCI

transmit/receive format should be set as follows: 8-bit data, 1 stop bit, no parity. The MCU

calculates the bit rate of the transmission from the host from the measured low period, and

transmits one H'00 byte to the host to indicate the end of bit rate adjustment. The host should

confirm that this adjustment end indication (H'00) has been received normally, and transmit one

H'55 byte to the MCU. If reception cannot be performed normally, initiate boot mode again

(reset), and repeat the above operations. Depending on the host’s transmission bit rate and the

MCU’s system clock frequency, there will be a discrepancy between the bit rates of the host and

the MCU. To ensure correct SCI operation, the host’s transfer bit rate should be set to (4800, or

Table 17.15 shows typical host transfer bit rates and system clock frequencies for which automatic

adjustment of the MCU’s bit rate is possible. The boot program should be executed within this

system clock range.

Table 17.15 System Clock Frequencies for which Automatic Adjustment of H8S/2345 Bit

Rate is Possible

Host Bit Rate

System Clock Frequency for which Automatic Adjustment

of H8S/2345 Bit Rate is Possible

8 MHz to 20 MHz

4 MHz to 20 MHz

On-Chip RAM Area Divisions in Boot Mode:

In boot mode, the 2 kbytes area from H'FFEC00

to H'FFF3FF is reserved for use by the boot program, as shown in figure 17.18. The area to which

the programming control program is transferred is H'FFF400 to H'FFFBFF. The boot program

area can be used when the programming control program transferred into RAM enters the

execution state. A stack area should be set up as required.

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