SH7108 Datasheet, PDF (275/560 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 8 Multifunction Timer Pulse Unit (MTU)
(7) Operation when Error Occurs during PWM Mode 1 Operation, and Operation is
Restarted in Normal Mode
Figure 8.90 shows an explanatory diagram of the case where an error occurs in PWM mode 1 and
operation is restarted in normal mode after re-setting.
1
2
3
RESET TMDR TOER
(PWM1) (1)
MTU module
output
TIOC*A
4
TIOR
(1 init
0 out)
5
6
PFC TSTR
(MTU) (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)
TIOC*B
• Not initialized (TIOC*B)
Port output
PEn
Hi-Z
PEn
Hi-Z
n=0 to 15
Figure 8.90 Error Occurrence in PWM Mode 1, Recovery in Normal Mode
1. After a reset, MTU output is low and ports are in the high-impedance state.
2. Set PWM mode 1.
3. For channels 3 and 4, enable output with TOER before initializing the pins with TIOR.
4. Initialize the pins with TIOR. (The example shows initial high output, with low output on
compare-match occurrence. In PWM mode 1, the TIOC*B side is not initialized.)
5. Set MTU output with the PFC.
6. The count operation is started by TSTR.
7. Output goes low 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.
11. Set normal mode.
12. Initialize the pins with TIOR.
13. Set MTU output with the PFC.
14. Operation is restarted by TSTR.
Rev.1.00 Sep. 18, 2008 Page 241 of 522
REJ09B0069-0100