H838532H datasheet(260/508 Pages) RENESAS

260 / 508 page

Section 9 Timers

Rev. 1.00 May 30, 2008 Page 240 of 484

REJ09B0436-0100

(4) TCF Clear Timing

TCF can be cleared by a compare match with OCRF.

(5) Timer Overflow Flag (OVF) Set Timing

OVF is set to 1 when TCF overflows from H'FFFF to H'0000.

(6) Compare Match Flag set Timing

The compare match flag (CMFH or CMFL) is set to 1 when the TCF and OCRF values match.

The compare match signal is generated in the last state during which the values match (when TCF

is updated from the matching value to a new value). When TCF matches OCRF, the compare

match signal is not generated until the next counter clock.

(7) Timer F Operation Modes

Timer F operation modes are shown in table 9.10.

Table 9.10

Timer F Operation Modes

Operation Mode

Reset

Active

Sleep

Watch

Sub-

active

Sub-

sleep

Standby

Module

Standby

TCF

Reset

Functions

Functions Functions/

Halted*

Functions/

Halted*

Functions/

Halted*

Halted

OCRF

Reset

Functions

Held

Functions

Held

TCRF

Reset

Functions

Held

Functions

Held

TCSRF

Reset

Functions

Held

Functions

Held

Note:

When

w/4 is selected as the TCF internal clock in active mode or sleep mode, since the

system clock and internal clock are mutually asynchronous, synchronization is

maintained by a synchronization circuit. This results in a maximum count cycle error of

φ (s). When the counter is operated in subactive mode, watch mode, or subsleep

mode,

w/4 must be selected as the internal clock. The counter will not operate if any

other internal clock is selected.

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