Renesas H8 Series Hardware Manual

Section 9 Timers
Rev. 7.00 Mar 10, 2005 page 322 of 652
REJ09B0042-0700
ECH is an 8-bit read-only up-counter that operates either as an independent 8-bit event counter or
as the upper 8-bit up-counter of a 16-bit event counter configured in combination with ECL. The
external asynchronous event AEVH pin, φ/2, φ/4, φ/8, or the overflow signal from lower 8-bit
counter ECL can be selected as the input clock source. ECH can be cleared to H'00 by software,
and is also initialized to H'00 upon reset.
Event Counter L (ECL)
ECL7 ECL2 ECL1 ECL0ECL6 ECL5 ECL4 ECL3
76543210
0
0000000
R
RRR
RRR
R
Bit
Initial Value
Read/Write
ECL is an 8-bit read-only up-counter that operates either as an independent 8-bit event counter or
as the lower 8-bit up-counter of a 16-bit event counter configured in combination with ECH. The
event clock from the external asynchronous event AEVL pin, φ/2, φ/4, or φ/8 is used as the input
clock source. ECL can be cleared to H'00 by software, and is also initialized to H'00 upon reset.
Clock Stop Register 2 (CKSTPR2)
LVDCKSTP
*
WDCKSTP
PW1CKSTP LDCKSTP PW2CKSTP AECKSTP
76543210
1
1111111
R/W
R/W R/W R/W
R/W
R/W
Bit
Initial value
Read/Write
Note: * Bits 6 and 5 are also reserved on products other than the H8/38124 Group.
CKSTPR2 is an 8-bit read/write register that performs module standby mode control for peripheral
modules. Only the bit relating to the asynchronous event counter is described here. For details of
the other bits, see the sections on the relevant modules.
Bit 3—Asynchronous Event Counter Module Standby Mode Control (AECKSTP)
Bit 3 controls setting and clearing of module standby mode for the asynchronous event counter.
AECKSTP Description
0 Asynchronous event counter is set to module standby mode
1 Asynchronous event counter module standby mode is cleared (initial value)

Renesas H8 Series Specifications

General

Brand	Renesas
Model	H8 Series
Category	Computer Hardware
Language	English