Table 18.8 System Clock Frequencies For Which Automatic Adjustment Of H8/3064F-Ztat B-Mask Version Bit Rate Is Possible - Hitachi H8/3062 Hardware Manual

Single-chip microcomputer h8/3062 series; h8/3062b series; h8/3062f-ztat series; h8/3064f-ztat series

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Automatic SCI Bit Rate Adjustment:

When boot mode is initiated, the H8/3064F-ZTAT B-mask version measure the low period of the

asynchronous SCI communication data (H'00) transmitted continuously from the host. The SCI

transmit/receive format should be set as 8-bit data, 1 stop bit, no parity. The H8/3064F-ZTAT B-

mask version calculate 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 H8/3064F-ZTAT B-mask version. 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 H8/3064F-ZTAT B-mask version's system clock frequency,

there will be a discrepancy between the bit rates of the host and the H8/3064F-ZTAT B-mask

version. To ensure correct SCI operation, the host's transfer bit rate should be set to 4800, 9600, or

19,200 bps * .

Table 18.8 shows typical host transfer bit rates and system clock frequencies for which automatic

adjustment of the H8/3064F-ZTAT B-mask version bit rate is possible. The boot program should

be executed within this system clock range.

Table 18.8 System Clock Frequencies for which Automatic Adjustment of H8/3064F-ZTAT

B-mask version Bit Rate is Possible

Host Bit Rate

System Clock Frequency for which Automatic Adjustment of

H8/3064F-ZTAT B-Mask Version Bit Rate is Possible (MHz)

Note: * Only use a setting of 4800, 9600, or 19200 bps for the host's bit rate. No other settings can

Although the H8/3064F-ZTAT B-mask version may also perform automatic bit rate

adjustment with bit rate and system clock combinations other than those shown in table

18.8, a degree of error will arise between the bit rates of the host and the H8/3064F-ZTAT

B-mask version, and subsequent transfer will not be performed normally. Therefore, only

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

(1 or more bits)