Renesas Hitachi H8S/2194 Series Hardware Manual page 392

Bit 0: Selecting the Input Capture A Signals (ICSA)
This bit works to select the input capture A signals.
Bit 0
ICSA Description
0 Selects the FTIA pin for inputting of the input capture A signals
1 Selects the HSW for inputting of the input capture A signals
(Initial value)
Rev. 2.0, 11/00, page 365 of 1037