Hitachi H8S/2199 Hardware Manual page 336

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
Rev. 1.0, 02/00, page 323 of 1141
(Initial value)