SH7108 Datasheet, PDF (184/560 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 8 Multifunction Timer Pulse Unit (MTU)
8.3.7 Timer General Register (TGR)
The TGR registers are dual function 16-bit readable/writable registers, functioning as either output
compare or input capture registers. The MTU has 16 TGR registers, four each for channels 0, 3,
and 4 and two each for channels 1 and 2. TGRC and TGRD for channels 0, 3, and 4 can also be
designated for operation as buffer registers. The TGR registers cannot be accessed in 8-bit units;
they must always be accessed as a 16-bit unit. TGR buffer register combinations are TGRA—
TGRC and TGRB—TGRD. The initial value is H'FFFF.
8.3.8 Timer Start Register (TSTR)
TSTR is an 8-bit readable/writable register that selects operation/stoppage for channels 0 to 4.
When setting the operating mode in TMDR or setting the count clock in TCR, first stop the TCNT
counter.
Initial
Bit Bit Name value R/W
7
CST4
0
R/W
6
CST3
0
R/W
5 to 3 —
All 0
R
2
CST2
0
R/W
1
CST1
0
R/W
0
CST0
0
R/W
Description
Counter Start 4 and 3
These bits select operation or stoppage for TCNT.
If 0 is written to the CST bit during operation with the
TIOC pin designated for output, the counter stops but the
TIOC pin output compare output level is retained. If TIOR
is written to when the CST bit is cleared to 0, the pin
output level will be changed to the set initial output value.
0: TCNT_4 and TCNT_3 count operation is stopped
1: TCNT_4 and TCNT_3 performs count operation
Reserved
These bits are always read as 0. The write value should
always be 0.
Counter Start 2 to 0
These bits select operation or stoppage for TCNT.
If 0 is written to the CST bit during operation with the
TIOC pin designated for output, the counter stops but the
TIOC pin output compare output level is retained. If TIOR
is written to when the CST bit is cleared to 0, the pin
output level will be changed to the set initial output value.
0: TCNT_2 and TCNT_0 count operation is stopped
1: TCNT_2 and TCNT_0 performs count operation
Rev.1.00 Sep. 18, 2008 Page 150 of 522
REJ09B0069-0100