参数资料
型号: XC68HC705X4DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 10/168页
文件大小: 656K
代理商: XC68HC705X4DW
Core Timer
Core timer registers
MC68HC05X4 Rev 1.0
MOTOROLA
Core Timer
107
5-ctimer
This bit is set when the output of the chosen stage becomes active;
an interrupt request will be generated if RTIE is set. When set, the bit
may be cleared by writing a ‘0’ to it.
CTOE — Core timer overflow interrupt enable
1 = A core timer overflow interrupt will be generated if CTOF is set
and the I-bit in the CCR is clear.
0 = No core timer overflow interrupt will be generated regardless of
the state of the CTOF flag and the I-bit.
RTIE — Real time interrupt enable
0 = A real time interrupt will be generated if RTIF is set and the I-bit
in the CCR is clear.
0 = No real time interrupt will be generated regardless of the state
of the RTIF flag and the I-bit.
RT1, RT0 — Real time interrupt rate select
These two bits select one of four taps from the real time interrupt
circuitry. Reset sets both RT0 and RT1 to one, selecting the lowest
periodic rate and therefore the maximum time in which to alter them if
necessary. The COP reset times are also determined by these two
bits. Care should be taken when altering RT0 and RT1 if a timeout is
imminent, or if the timeout period is uncertain. If the selected tap is
modified during a cycle in which the counter is switching, an RTIF
could be missed or an additional one could be generated. To avoid
problems, the COP should be cleared before changing the RTI taps.
See Table 1 for some example RTI periods.
Table 1. Example RTI periods
Bus frequency
fOP = 500 kHz
Bus frequency
fOP = 1 MHz
Bus frequency
fOP = 2 MHz
RT1 RT0
Division
ratio
RTI
period
Minimum
COP
period
RTI
period
Minimum
COP
period
RTI
period
Minimum
COP
period
00
214
31.3ms
218.8ms
15.6ms
109.4ms
7.8ms
54.7ms
01
215
62.5ms
437.5ms
31.3ms
218.8ms
15.6ms
109.4ms
10
216
125ms
875.0ms
62.5ms
437.5ms
31.3ms
218.8ms
11
217
250ms
1.75s
125.1ms
875.0ms
62.5ms
437.5ms
相关PDF资料
PDF描述
XC7455ARX1000LF 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA483
XC7455ARX867LF 32-BIT, 867 MHz, RISC PROCESSOR, CBGA483
XC4013E-1HQG240C FPGA, 576 CLBS, 10000 GATES, 166 MHz, PQFP240
XC4013E-2HQG240C FPGA, 576 CLBS, 10000 GATES, 125 MHz, PQFP240
XC4013E-2HQG240I FPGA, 576 CLBS, 10000 GATES, 125 MHz, PQFP240
相关代理商/技术参数
参数描述
XC68HC711D3CFS3 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
XC68HC711E9CFS2 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
XC68HC711E9CFS3 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
XC68HC711G5CFN 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
XC68HC711G5FN 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller