Timer Counters (Tcnt) - Hitachi H8/3048 Hardware Manual

Bits 3 and 2—Reserved: Read-only bits, always read as 1.
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Bit 1—Output Level Select 4 (OLS4): Selects output levels in complementary PWM mode and
reset-synchronized PWM mode.
Bit 1
OLS4 Description
0 TIOCA , TIOCA
3
1 TIOCA , TIOCA
3
Bit 0—Output Level Select 3 (OLS3): Selects output levels in complementary PWM mode and
reset-synchronized PWM mode.
Bit 0
OLS3 Description
0 TIOCB , TOCXA
3
1 TIOCB , TOCXA
3

10.2.7 Timer Counters (TCNT)

TCNT is a 16-bit counter. The ITU has five TCNTs, one for each channel.
Channel Abbreviation
0 TCNT0
1 TCNT1
2 TCNT2
3 TCNT3
4 TCNT4
Bit 15
Initial value 0
R/W
Read/Write
Each TCNT is a 16-bit readable/writable register that counts pulse inputs from a clock source. The
clock source is selected by bits TPSC2 to TPSC0 in TCR.
, and TIOCB outputs are inverted
4 4
, and TIOCB outputs are not inverted
4 4
, and TOCXB outputs are inverted
4 4
, and TOCXB outputs are not inverted
4 4
Function
Up-counter
Phase counting mode: up/down-counter
Other modes: up-counter
Complementary PWM mode: up/down-counter
Other modes: up-counter
14 13 12 11 10
0 0 0 0 0
R/W R/W R/W R/W R/W
9 8 7 6 5
0 0 0 0 0
R/W R/W R/W R/W R/W
319
(Initial value)
(Initial value)
4 3 2 1 0
0 0 0 0 0
R/W R/W R/W R/W R/W