Datasheet

Section 17 Smart Card Interface
R01UH0166EJ0600 Rev. 6.00 Page 833 of 1434
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
Thus the reception margin in asynchronous mode is given by the following formula.
Formula for reception margin in smart card interface mode
M =⎮(0.5 –
1
2N
) – (L – 0.5) F –
| D – 0.5 |
N
(1 + F)⎮ × 100%
Where M: Reception margin (%)
N: Ratio of bit rate to clock (N = 32, 64, 372, and 256)
D: Clock duty (D = 0 to 1.0)
L: Frame length (L = 10)
F: Absolute value of clock frequency deviation
Assuming values of F = 0, D = 0.5 and N = 372 in the above formula, the reception margin
formula is as follows.
When D = 0.5 and F = 0,
M = (0.5 – 1/2 × 372) × 100%
= 49.866%