JAJSHM4U April 2001 – July 2019 TMS320F2810 , TMS320F2811 , TMS320F2812
PRODUCTION DATA.
デバイスごとのパッケージ図は、PDF版データシートをご参照ください。
Figure 6-20 shows the OSC and PLL block on F281x.
The on-chip oscillator circuit enables a crystal to be attached to the F281x devices using the X1/XCLKIN and X2 pins. If a crystal is not used, then an external oscillator can be directly connected to the X1/XCLKIN pin and the X2 pin is left unconnected. The logic-high level in this case should not exceed VDD. The PLLCR bits [3:0] set the clocking ratio.
BIT(S) | NAME | TYPE | XRS
RESET(1) |
DESCRIPTION | ||
---|---|---|---|---|---|---|
15:4 | Reserved | R = 0 | 0:0 | |||
3:0 | DIV | R/W | 0,0,0,0 | SYSCLKOUT = (XCLKIN * n)/2, where n is the PLL multiplication factor. | ||
Bit Value | n | SYSCLKOUT | ||||
0000 | PLL Bypassed | XCLKIN/2 | ||||
0001 | 1 | XCLKIN/2 | ||||
0010 | 2 | XCLKIN | ||||
0011 | 3 | XCLKIN * 1.5 | ||||
0100 | 4 | XCLKIN * 2 | ||||
0101 | 5 | XCLKIN * 2.5 | ||||
0110 | 6 | XCLKIN * 3 | ||||
0111 | 7 | XCLKIN * 3.5 | ||||
1000 | 8 | XCLKIN * 4 | ||||
1001 | 9 | XCLKIN * 4.5 | ||||
1010 | 10 | XCLKIN * 5 | ||||
1011 | 11 | Reserved | ||||
1100 | 12 | Reserved | ||||
1101 | 13 | Reserved | ||||
1110 | 14 | Reserved | ||||
1111 | 15 | Reserved |