Hitachi H8S/2633 Hardware Manual page 695

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 BRR and the CKS1,

CKS0, BCP1 and BCP0 bits in SMR. The formula for calculating the bit rate is as shown below.

Table 17-5 shows some sample bit rates.

If clock output is selected by setting CKE0 to 1, a clock is output from the SCK pin. The clock

frequency is determined by the bit rate and the setting of bits BCP1 and BCP0.

Where: N = Value set in BRR (0 ≤ N ≤ 255)

B = Bit rate (bit/s)

ø = Operating frequency (MHz)

n = See table 17-4

S = Number of internal clocks in 1-bit period, set by BCP1 and BCP0

Table 17-4 Correspondence between n and CKS1, CKS0

Table 17-5 Examples of Bit Rate B (bit/s) for Various BRR Settings

(When n = 0 and S = 372)

Note: Bit rates are rounded to the nearest whole number.