H8S2245 datasheet(408/818 Pages) RENESAS

tên linh kiện	H8S2245

Giải thích chi tiết về linh kiện	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

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Section 10 8-Bit Timers

Rev.3.00 Mar. 26, 2007 Page 366 of 772

REJ09B0355-0300

Each pair of registers for channel 0 and channel 1 is a 16-bit register with the upper 8 bits for

channel 0 and the lower 8 bits for channel 1, so they can be accessed together by word transfer

instruction.

10.2

10.2.1

Timer Counters 0 and 1 (TCNT0, TCNT1)

R/W

TCNT0

TCNT1

Bit

Initial value

R/W

TCNT0 and TCNT1 are 8-bit readable/writable up-counters that increment on pulses generated

from an internal or external clock source. This clock source is selected by clock select bits CKS2

to CKS0 of TCR. The CPU can read or write to TCNT0 and TCNT1 at all times.

TCNT0 and TCNT1 comprise a single 16-bit register, so they can be accessed together by word

transfer instruction.

TCNT0 and TCNT1 can be cleared by an external reset input or by a compare match signal.

Which signal is to be used for clearing is selected by clock clear bits CCLR1 and CCLR0 of TCR.

When a timer counter overflows from H'FF to H'00, OVF in TCSR is set to 1.

TCNT0 and TCNT1 are each initialized to H'00 by a reset and in hardware standby mode.

H8S2245 bảng dữ liệu(PDF) 408 Page - Renesas Technology Corp