CHAPTER 7 TIMER ARRAY UNIT
Page 159 of 920
7.3.4
Timer status register mn (TSRmn)
The TSRmn register indicates the overflow status of the counter of channel n.
The TSRmn register is valid only in the capture mode (MDmn3 to MDmn1 = 010B) and capture & one-count
mode (MDmn3 to MDmn1 = 110B). See
for the operation of the OVF bit in each operation mode and
set/clear conditions.
The TSRmn register can be read by a 16-bit memory manipulation instruction.
The lower 8 bits of the TSRmn register can be set with an 8-bit memory manipulation instruction with TSRmnL.
Reset signal generation clears this register to 0000H.
Figure 7 - 16 Format of Timer status register mn (TSRmn)
Remark
m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3)
Remark
The OVF bit does not change immediately after the counter has overflowed, but changes upon the subsequent capture.
Address: F01A0H, F01A1H (TSR00) to F01A6H, F01A7H (TSR03)
After reset: 0000H
F01E0H, F01E1H (TSR10) to F01E6H, F01E7H (TSR13)
Symbol
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TSRmn
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
OVF
Counter overflow status of channel n
0
Overflow does not occur.
1
Overflow occurs.
When OVF = 1, this flag is cleared (OVF = 0) when the next value is captured without overflow.
Table 7 - 3 OVF Bit Operation and Set/Clear Conditions in Each Operation Mode
Timer operation mode
OVF bit
Set/clear conditions
• Capture mode
• Capture & one-count mode
clear
When no overflow has occurred upon capturing
set
When an overflow has occurred upon capturing
• Interval timer mode
• Event counter mode
• One-count mode
clear
—
(Use prohibited)
set
Содержание RL78/G1H
Страница 941: ...R01UH0575EJ0120 RL78 G1H...