参数资料
型号: MC68HC05F4CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 74/130页
文件大小: 2089K
代理商: MC68HC05F4CP
MOTOROLA
5-4
MC68HC05F4
CORE TIMER
5
RTOF — Reset timer overow ag
Writing a ‘1’ to this bit clears the timer overow ag, CTOF. See CTOF description.
RRTIF — Reset real time overow ag
Wrting a ‘1’ to this bit clears the real time interrupt ag, RTIF. See RTIF description.
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 the timeout period is uncertain.
If the selected tap is modied 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 5-1 for some example RTI periods.
5.2.2
Core timer counter register (CTCR)
The core timer counter register is a read-only register, which contains the current value of the 8-bit
ripple counter at the beginning of the timer chain. Reset clears this register.
Table 5-1 Example RTI periods
RTI Rates at fOP Frequency Specied
RT1 RT0
Division
ratio
16.384 kHz
447 kHz
895 kHz
1.789 MHz
00
214
1 s
36.7 ms
18.35 ms
9.17 ms
01
215
2 s
73.4 ms
36.7 ms
18.35 ms
10
216
4 s
146.8 ms
73.4 ms
36.7 ms
11
217
8 s
293.6 ms
146.8 ms
73.4 ms
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Core timer counter (CTCR)
$0009
0000 0000
TPG
44
05F4Book Page 4 Tuesday, August 5, 1997 1:10 pm
相关PDF资料
PDF描述
MK2731-04S 36.864 MHz, VIDEO CLOCK GENERATOR, PDSO16
MC68HC11F1CFN4R2 8-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PQCC68
MC68HC11KS1CFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC68
MB90F548GPF 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
MPD78C11AGQA-XXX-36 8-BIT, MROM, 15 MHz, MICROCONTROLLER, PZIP64
相关代理商/技术参数
参数描述
MC68HC05F5 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05F6 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MCU with DTMF/melody generator
MC68HC05F6P 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
MC68HC05F8 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit
MC68HC05J1 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:HCMOS MICROCONTROLLER UNIT