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參數資料
型號: MC68HC705BD3
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數: 41/112頁
文件大小: 676K
代理商: MC68HC705BD3
MC68HC05BD3
MOTOROLA
5-1
MULTI-FUNCTION TIMER
5
5
MULTI-FUNCTION TIMER
The MFT provides miscellaneous functions to the MC68HC05BD3 MCU. It includes a timer
overflow function, real-time interrupt, and COP watchdog. The external interrupt (IRQ) triggering
option is also set by this module’s MFT Control and Status Register.
The clock base for this module is derived from the bus clock divided by four. For a 2MHz E (CPU)
clock, the clock base is 0.5MHz. This clock base is then divided by an 8-stage ripple counter to
generate the timer overflow. Timer overflow rate is thus E/1024. The output of this 8-stage ripple
counter then drives a 4-stage divider to generate real time interrupt. Hence, the clock base for real
time interrupt is E/16384. Real time interrupt rate is selected by RT0 and RT1 bits of MFT Control
and Status register. The interrupt rates are E/16384, (E/16384)/2, (E/16384)/4, and (E/16384)/8.
The selected real time interrupt rate is then divided by 8 to generate COP reset.
5.1
MFT Counter Register
The MFT counter register (MFTCR) can be read at location $0009. It is cleared by reset.
5.2
MFT Control and Status Register
Register bit definitions:
TOF - Timer Overflow
1 (set)
8-bit ripple timer overflow has occurred.
0 (clear) –
No 8-bit ripple timer overflow has occurred.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
MFT Control and Status Register
$1C
TOF
RTIF
TOFIE
RTIE
IRQN
RT1
RT0
0000 0011
TPG
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相關代理商/技術參數
參數描述
MC68HC705BD3P 制造商:Motorola 功能描述:MOTOROLA NXC4C
MC68HC705BD7P1 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HC705C4ACP 制造商:Freescale Semiconductor 功能描述:
MC68HC705C8AB 功能描述:IC MCU 8K OTP 2.1MHZ 42-SDIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN,SCI,SPI 外圍設備:POR,PWM,溫度傳感器,WDT 輸入/輸出數:21 程序存儲器容量:40KB(20K x 16) 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數據轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323
MC68HC705C8ACB 制造商:Rochester Electronics LLC 功能描述:HCO5 CORE + 8K RAM + EPR - Bulk
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