Datasheet

Table Of Contents
Section 11 8-Bit Timers (TMR)
REJ09B0140-0900 Rev. 9.00 Page 363 of 846
Sep 16, 2010
H8S/2215 Group
11.7.2 A/D Converter Activation
The A/D converter can be activated only by TMR_0 compare match A. If the ADTE bit in TCSR0
is set to 1 when the CMFA flag is set to 1 by the occurrence of TMR_0 compare match A, a
request to start A/D conversion is sent to the A/D converter. If the 8-bit timer conversion start
trigger has been selected on the A/D converter side at this time, A/D conversion is started.
11.8 Usage Notes
11.8.1 Contention between TCNT Write and Clear
If a timer counter clock pulse is generated during the T
2
state of a TCNT write cycle, the clear
takes priority, so that the counter is cleared and the write is not performed. Figure 11.10 shows this
operation.
φ
Address
TCNT address
Internal write signal
Counter clear signal
TCNT
N H'00
T
1
T
2
TCNT write cycle by CPU
Figure 11.10 Contention between TCNT Write and Clear