62:
PITs may be one-shot or periodic. One-shot timers will signal only once and then stop counting. Periodic timers signal every time they reach a specific value and then restart, thus producing a signal at periodic intervals. Periodic timers are typically used to invoke activities that must be performed
220:
66:
Counters are usually programmed with fixed intervals that determine how long the counter will count before it will output a signal.
124:
in newer Intel systems offers a higher-resolution (one microsecond) timer. This is used in preference to the PIT timer in
260:
110:
255:
209:
137:
142:
50:
that generates an output signal when it reaches a programmed count. The output signal may trigger an
221:
Determining and changing the rate of timer interrupts a guest operating system requests (1005802)
101:, therefore one quarter of the 4.77 MHz CPU clock) and contains three timers. Timer 0 is used by
98:
102:
79:
47:
17:
35:
235:
249:
188:
125:
86:
90:
167:
240:
114:
75:
51:
27:
Counter that generates an output signal when it reaches a programmed count
168:"Bran's Kernel Development Tutorial: The Programmable Interval Timer"
147:
121:
106:
94:
83:
31:
210:μ-second precision timer support for the Linux kernel
109:
as a system timer, timer 1 was historically used for
8:
78:PIT was the original timing device used on
189:"Programmable Interval Timer - OSDev Wiki"
159:
7:
97:, one twelfth of the system clock
25:
241:Timing on the PC family under DOS
236:High Performance Windows Timers
113:refreshes and timer 2 for the
1:
191:. Wiki.osdev.org. 2012-06-26
111:dynamic random access memory
208:Uwe Walter, Vincent Oberle
40:programmable interval timer
18:Programmable Interval Timer
277:
138:High Precision Event Timer
143:Monostable multivibrator
128:starting with 2.6.18.
63:at regular intervals.
82:. It used a 1.193182
261:Digital electronics
105:(uniprocessor) and
256:IBM PC compatibles
99:crystal oscillator
93:frequency used by
89:(one third of the
80:IBM PC compatibles
103:Microsoft Windows
70:IBM PC compatible
16:(Redirected from
268:
223:
218:
212:
206:
200:
199:
197:
196:
185:
179:
178:
176:
175:
164:
36:embedded systems
21:
276:
275:
271:
270:
269:
267:
266:
265:
246:
245:
232:
227:
226:
219:
215:
207:
203:
194:
192:
187:
186:
182:
173:
171:
166:
165:
161:
156:
134:
72:
60:
58:Common features
28:
23:
22:
15:
12:
11:
5:
274:
272:
264:
263:
258:
248:
247:
244:
243:
238:
231:
230:External links
228:
225:
224:
213:
201:
180:
158:
157:
155:
152:
151:
150:
145:
140:
133:
130:
71:
68:
59:
56:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
273:
262:
259:
257:
254:
253:
251:
242:
239:
237:
234:
233:
229:
222:
217:
214:
211:
205:
202:
190:
184:
181:
170:. Osdever.net
169:
163:
160:
153:
149:
146:
144:
141:
139:
136:
135:
131:
129:
127:
126:Linux kernels
123:
118:
116:
112:
108:
104:
100:
96:
92:
88:
85:
81:
77:
69:
67:
64:
57:
55:
53:
49:
45:
41:
37:
33:
19:
216:
204:
193:. Retrieved
183:
172:. Retrieved
162:
119:
87:clock signal
73:
65:
61:
43:
39:
29:
91:color burst
250:Categories
195:2013-10-30
174:2013-10-30
154:References
115:PC speaker
76:Intel 8253
52:interrupt
32:computing
132:See also
48:counter
46:) is a
34:and in
148:NE555
122:LAPIC
107:Linux
120:The
95:NTSC
74:The
38:, a
84:MHz
44:PIT
30:In
252::
117:.
54:.
198:.
177:.
42:(
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.