參數(shù)資料
型號(hào): CY7C63742-SC
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 12 MHz, RISC MICROCONTROLLER, PDSO24
封裝: 0.300 INCH, PLASTIC, SOIC-24
文件頁(yè)數(shù): 22/48頁(yè)
文件大?。?/td> 425K
代理商: CY7C63742-SC
PRELIMINARY
FO R
enCoRe USB CY7C63722/23
CY7C63742/43
29
18.0
12-bit Free-running Timer
The 12-bit timer operates with a 1-
s tick, provides two interrupts (128 s and 1.024 ms) and allows the firmware to directly time
events that are up to 4 ms in duration. The lower 8 bits of the timer can be read directly by the firmware. Reading the lower 8 bits
latches the upper 4 bits into a temporary register. When the firmware reads the upper 4 bits of the timer, it is actually reading the
count stored in the temporary register. The effect of this is to ensure a stable 12-bit timer value can be read, even when the two
reads are separated in time.
7
6
5
4
3
2
1
0
R
Timer
Bit 7
Timer
Bit 6
Timer
Bit 5
Timer
Bit 4
Timer
Bit 3
Timer
Bit 2
Timer
Bit 1
Timer
Bit 0
Figure 18-1. Timer LSB Register (Address 0x24)
7
6
5
4
3
2
1
0
R
Reserved
Timer
Bit 11
Timer
Bit 10
Timer
Bit 9
Timer
Bit 8
Figure 18-2. Timer MSB Register (Address 0x25)
Figure 18-3. Timer Block Diagram
10
9
7
85
6
432
1 MHz clock
1.024-ms interrupt
128-s interrupt
To Timer Registers
8
1
0
11
L1
L0
L2
L3
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
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