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Section 11 Multi-Function Timer Pulse Unit 2
Page 578 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
11.4.9 A/D Converter Start Request Delaying Function
A/D converter start requests can be issued in channel 4 by making settings in the timer A/D
converter start request control register (TADCR), timer A/D converter start request cycle set
registers (TADCORA_4 and TADCORB_4), and timer A/D converter start request cycle set
buffer registers (TADCOBRA_4 and TADCOBRB_4).
The A/D converter start request delaying function compares TCNT_4 with TADCORA_4 or
TADCORB_4, and when their values match, the function issues a respective A/D converter start
request (TRG4AN or TRG4BN).
A/D converter start requests (TRG4AN and TRG4BN) can be skipped in coordination with
interrupt skipping by setting the ITA3AE, ITA4VE, ITB3AE, and ITB4VE bits in TADCR.
Example of Procedure for Specifying A/D Converter Start Request Delaying Function
Figure 11.73 shows an example of procedure for specifying the A/D converter start request
delaying function.
Set A/D converter start request cycle
A/D converter start request
delaying function
•
Set the timing of transfer
from cycle set buffer register
•
Set linkage with interrupt skipping
•
Enable A/D converter start
request delaying function
A/D converter start request
delaying function
[1]
[2]
[1] Set the cycle in the timer A/D converter start request cycle
buffer register (TADCOBRA_4 or TADCOBRB_4) and timer
A/D converter start request cycle register (TADCORA_4 or
TADCORB_4). (The same initial value must be specified in
the cycle buffer register and cycle register.)
[2] Use bits BF1 and BF2 in the timer A/D converter start
request control register (TADCR) to specify the timing of
transfer from the timer A/D converter start request cycle
buffer register to A/D converter start request cycle register.
•
Specify whether to link with interrupt skipping through bits
ITA3AE, ITA4VE, ITB3AE, and ITB4VE.
•
Use bits TU4AE, DT4AE, UT4BE, and DT4BE to enable
A/D conversion start requests (TRG4AN or TRG4BN).
Notes: 1. Perform TADCR setting while TCNT_4 is stopped.
2. Do not set BF1 to 1 when complementary PWM mode
is not selected.
3. Do not set ITA3AE, ITA4VE, ITB3AE, ITB4VE,
DT4AE, or DT4BE to 1 when complementary PWM
mode is not selected.
Figure 11.73 Example of Procedure for Specifying A/D Converter
Start Request Delaying Function