Hitachi H8S/2633 Hardware Manual page 1148

C.11 Port E Block Diagram
PF0
Legend
WDDRF
WDRF
RDRF
RPORF
1136
: Write to PFDDR
: Write to PFDR
: Read PFDR
: Read port F
Figure C-11 (a) Port F Block Diagram (Pin PF0)
Mode 4/5/6
Reset
R
Q D
PF0DDR
C
WDDRF
Bus controller
BRLE bit
Reset
R
Q D
PF0DR
C
WDRF
RDRF
RPORF
Bus request input
IRQ interrupt input