Timer I/O Control Register (Tior) - Hitachi H8/3022 Hardware Manual

8.2.11 Timer I/O Control Register (TIOR)

TIOR is an 8-bit register. The ITU has five TIORs, one in each channel.
Channel Abbreviation
0 TIOR0
1 TIOR1
2 TIOR2
3 TIOR3
4 TIOR4
Bit
Initial value
Read/Write
Reserved bit
Each TIOR is an 8-bit readable/writable register that selects the output compare or input capture
function for GRA and GRB, and specifies the functions of the TIOCA and TIOCB pins. If the
output compare function is selected, TIOR also selects the type of output. If input capture is
selected, TIOR also selects the edge or edges of the input capture signal.
TIOR is initialized to H'88 by a reset and in standby mode.
212
Function
TIOR controls the general registers. Some functions differ in PWM
mode. TIOR3 and TIOR4 settings are ignored when complementary
PWM mode or reset-synchronized PWM mode is selected in
channels 3 and 4.
7 6
— IOB2 IOB1
1 0
— R/W R/W
I/O control B2 to B0
These bits select GRB functions
5 4
IOB0
0 0
R/W
Reserved bit
3 2
— IOA2 IOA1
1 0
— R/W R/W
I/O control A2 to A0
These bits select GRA
functions
1 0
IOA0
0 0
R/W