SH7055S Datasheet, PDF (353/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

• Bit 0—Down-Count Start 8A (DST8A): Starts down-counter 8A (DCNT8A).
Bit 0: DST8A
0
1
Description
DCNT8A is halted
(Initial value)
[Clearing conditions]
When the DCNT8A value underflows, or on channel 1 (GR1A or OCR1)
compare-match
DCNT8A counts
[Setting conditions]
• One-shot pulse function: Set by user program (DCNT8A ≠ H'0000)
• Offset one-shot pulse function: Set on OCR1 compare-match or GR1A
compare-match, or by user program (DCNT8A ≠ H'0000)
11.2.12 Timer Connection Register (TCNR)
The timer connection register (TCNR) is a 16-bit register. The ATU-II has one TCNR register in
channel 8.
Bit:
Initial value:
R/W:
15
CN8P
0
R/W
14
CN8O
0
R/W
13
CN8N
0
R/W
12
CN8M
0
R/W
11
CN8L
0
R/W
10
CN8K
0
R/W
9
CN8J
0
R/W
8
CN8I
0
R/W
Bit:
Initial value:
R/W:
7
CN8H
0
R/W
6
CN8G
0
R/W
5
CN8F
0
R/W
4
CN8E
0
R/W
3
CN8D
0
R/W
2
CN8C
0
R/W
1
CN8B
0
R/W
0
CN8A
0
R/W
TCNR is a 16-bit readable/writable register that enables or disables connection between the
channel 8 down-count start register (DSTR) and channel 1 and 2 compare-match signals (down-
count start triggers). Channel 1 down-count start triggers A to H are channel 1 OCR1 compare-
match signals or GR1x compare-match signals (set in TRGMDR). Channel 2 down-count start
triggers A to H are channel 2 OCR2x compare-match signals. When GR1x compare-matches are
used, set TIOR1A to TIOR1D to allow compare-matches.
TCNR is initialized to H'0000 by a power-on reset, and in hardware standby mode and software
standby mode.
For details, see sections 11.3.5, One-Shot Pulse Function, and 11.3.6, Offset One-Shot Pulse
Function and Output Cutoff Function.
Rev.2.0, 07/03, page 315 of 960