Clock - Hitachi H8/3062 Hardware Manual

Single-chip microcomputer

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Clock

Only an internal clock generated by the on-chip baud rate generator can be used as the

transmit/receive clock for the smart card interface. The bit rate is set with the bit rate register

(BRR) and the CKS1 and CKS0 bits in the serial mode register (SMR). The equation for

calculating the bit rate is shown below. Table 13.5 shows some sample bit rates.

If clock output is selected with CKE0 set to 1, a clock with a frequency of 372 times the bit rate is

output from the SCK pin.

where, N: BRR setting (0 N 255)

B: Bit rate (bit/s)

φ: Operating frequency (MHz)

n: See table 13.4

Table 13.4 n-Values of CKS1 and CKS0 Settings

Note:* If the gear function is used to divide the clock frequency, use the divided frequency to

calculate the bit rate. The equation above applies directly to 1/1 frequency division.

Table 13.5 Bit Rates (bits/s) for Various BRR Settings (When n = 0)

Note: Bit rates are rounded off to two decimal places.