H8SSLASH2224 datasheet(482/1071 Pages) RENESAS

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Section 11 16-Bit Timer Pulse Unit (TPU)

Rev. 5.00 Aug 08, 2006 page 396 of 982

REJ09B0054-0500

11.3.6

Timer Counter (TCNT)

The TCNT registers are 16-bit readable/writable counters. The TPU of the H8S/2227 Group has a

total of three TCNT registers, one each for channels 0 to 2. In other groups, the TPU has a total of

six TCNT registers, one each for channels 0 to 5.

The TCNT counters are initialized to H'0000 by a reset, or in hardware standby mode.

The TCNT counters cannot be accessed in 8-bit units; they must always be accessed as a 16-bit

unit.

11.3.7

Timer General Register (TGR)

The TGR registers are 16-bit readable/writable registers with a dual function as output compare

and input capture registers. The TPU of the H8S/2227 Group has a total of four TGR registers,

two for channel 0 and one each for channels 1 and 2. In other groups, the TPU has a total of eight

TGR registers, two each for channels 0 and 3, and one each for channels 1, 2, 4, and 5. TGRC and

TGRD for channels 0 and 3 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.

11.3.8

Timer Start Register (TSTR)

In the H8S/2227 Group, TSTR selects operate/stop for channels 0 to 2. In other groups, TSTR

selects operate/stop for channels 0 to 5. 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

7, 6

—

All 0

—

Reserved

The write value should always be 0.

CST5*

CST4*

CST3*

CST2

CST1

CST0

R/W

Counter Start 5 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_5 to TCNT_0 count operation is stopped

1: TCNT_5 to TCNT_0 performs count operation

Note:

* In the H8S/2227 Group, bits 5 to 3 are reserved. The write value should always be 0.

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