SH7101 Datasheet, PDF (282/486 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

8. Multi-Function Timer Pulse Unit (MTU)
(26) Operation when Error Occurs during Reset-Synchronous PWM Mode Operation, and
Operation is Restarted in Normal Mode: Figure 8.109 shows an explanatory diagram of the
case where an error occurs in reset-synchronous PWM mode and operation is restarted in normal
mode after re-setting.
MTU module
output
TIOC3A
1
2
3
4
RESET TOCR TMDR TOER
(CPWM) (1)
5
PFC
(MTU)
6
TSTR
(1)
7
8
9
10
11
12
Match Error PFC TSTR TMDR TIOR
occurs (PORT) (0) (normal) (1 init
0 out)
13
PFC
(MTU)
14
TSTR
(1)
TIOC3B
TIOC3D
Port output
PE8
Hi-Z
PE9
Hi-Z
PE11
Hi-Z
Figure 8.109 Error Occurrence in Reset-Synchronous PWM Mode,
Recovery in Normal Mode
1. After a reset, MTU output is low and ports are in the high-impedance state.
2. Select the reset-synchronous PWM output level and cyclic output enabling/disabling with
TOCR.
3. Set reset-synchronous PWM.
4. Enable channel 3 and 4 output with TOER.
5. Set MTU output with the PFC.
6. The count operation is started by TSTR.
7. The reset-synchronous PWM waveform is output on compare-match occurrence.
8. An error occurs.
9. Set port output with the PFC and output the inverse of the active level.
10. The count operation is stopped by TSTR. (MTU output becomes the reset-synchronous PWM
output initial value.)
11. Set normal mode. (MTU positive phase output is low, and negative phase output is high.)
12. Initialize the pins with TIOR.
13. Set MTU output with the PFC.
14. Operation is restarted by TSTR.
Rev.2.00 Sep. 27, 2007 Page 248 of 448
REJ09B0394-0200