SH7101 datasheet(161/486 Pages) RENESAS

161 / 486 page

8. Multi-Function Timer Pulse Unit (MTU)

Rev.2.00 Sep. 27, 2007 Page 127 of 448

REJ09B0394-0200

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.

Bit

Bit Name

Initial

value

R/W

Description

CST4

CST3

R/W

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

5 to 3

⎯

All 0

Reserved

These bits are always read as 0. Only 0 should be written

to these bits.

CST2

CST1

CST0

R/W

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

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