Timer Control Registers (Tcr) - Renesas H8/3067 Series User Manual

Section 9 16-Bit Timer
9.2.9

Timer Control Registers (TCR)

TCR is an 8-bit register. The 16-bit timer has three TCRs, one in each channel.
Channel Abbreviation
0 TCR0
1 TCR1
2 TCR2
Bit 7

Initial value 1

Read/Write
Reserved bit
Each TCR is an 8-bit readable/writable register that selects the timer counter clock source, selects
the edge or edges of external clock sources, and selects how the counter is cleared.
TCR is initialized to H'80 by a reset and in standby mode.
Bit 7—Reserved: This bit cannot be modified and is always read as 1.
Rev. 4.00 Jan 26, 2006 page 352 of 938
REJ09B0276-0400
Function
CR controls the timer counter. The TCRs in all channels are
functionally identical. When phase counting mode is
selected in channel 2, the settings of bits CKEG1 and
CKEG0 and TPSC2 to TPSC0 in TCR2 are ignored.
6 5
CCLR1 CCLR0 CKEG1
0 0
R/W R/W R/W
Clock edge 1/0
These bits select external clock edges
Counter clear 1/0
These bits select the counter clear source
4 3 2
CKEG0 TPSC2
0 0 0
R/W R/W
Timer prescaler 2 to 0
These bits select the
counter clock
1 0
TPSC1 TPSC0
0 0
R/W R/W