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參數資料

型號：	MC68332VFV16
廠商：	MOTOROLA INC
元件分類：	微控制器/微處理器
英文描述：	32-Bit Modular Microcontroller
中文描述：	32-BIT, 16.78 MHz, MICROCONTROLLER, PQFP144
封裝：	QFP-144
文件頁數：	22/88頁
文件大小：	446K
代理商：	MC68332VFV16

MOTOROLA

MC68332

MC68332TS/D

3.2.7 Periodic Interrupt Timer

The periodic interrupt timer (PIT) generates interrupts of specified priorities at specified intervals. Timing

for the PIT is provided by a programmable prescaler driven by the system clock.

This register contains information concerning periodic interrupt priority and vectoring. Bits [10:0] can be

read or written at any time. Bits [15:11] are unimplemented and always return zero.

PIRQL[2:0] — Periodic Interrupt Request Level

The following table shows what interrupt request level is asserted when a periodic interrupt is generat-

ed. If a PIT interrupt and an external IRQ signal of the same priority occur simultaneously, the PIT in-

terrupt is serviced first. The periodic timer continues to run when the interrupt is disabled.

PIV[7:0] — Periodic Interrupt Vector

The bits of this field contain the vector generated in response to an interrupt from the periodic timer.

When the SIM responds, the periodic interrupt vector is placed on the bus.

The PITR contains the count value for the periodic timer. A zero value turns off the periodic timer. This

PTP — Periodic Timer Prescaler Control

0 = Periodic timer clock not prescaled

1 = Periodic timer clock prescaled by a value of 512

The reset state of PTP is the complement of the state of the MODCLK signal during reset.

PITM[7:0] — Periodic Interrupt Timing Modulus Field

This is an 8-bit timing modulus. The period of the timer can be calculated as follows:

PIT Period = [(PITM)(Prescaler)(4)]/EXTAL

where

PIT Period = Periodic interrupt timer period

PITM = Periodic interrupt timer register modulus (PITR[7:0])

EXTAL Frequency = Crystal frequency

Prescale = 512 or 1 depending on the state of the PTP bit in the PITR

PICR

— Periodic Interrupt Control Register

$YFFA22

PIRQL

PIV

RESET:

PIRQL

000

001

010

011

100

101

110

111

Interrupt Request Level

Periodic Interrupt Disabled

Interrupt Request Level 1

Interrupt Request Level 2

Interrupt Request Level 3

Interrupt Request Level 4

Interrupt Request Level 5

Interrupt Request Level 6

Interrupt Request Level 7

PITR

—Periodic Interrupt Timer Register

$YFFA24

PTP

PITM

RESET:

MODCLK

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MC68332CFV20	32-Bit Modular Microcontroller

相關代理商/技術參數	參數描述
MC68332VFV20	制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:32-Bit Modular Microcontroller
MC68334	制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Technical Supplement
MC68334GCEH16	功能描述:IC MCU 16MHZ 2K RAM 132-PQFP RoHS:是類別:集成電路 (IC) >> 嵌入式 - 微控制器，系列:M683xx 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位速度:16MHz 連通性:SIO 外圍設備:- 輸入/輸出數:32 程序存儲器容量:8KB（8K x 8）程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數據轉換器:- 振蕩器型:外部工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件其它名稱:864285
MC68334GCEH16	制造商:Freescale Semiconductor 功能描述:Microcontroller
MC68334GCEH20	功能描述:IC MICROPROCESSOR 20MHZ 132-PQFP RoHS:是類別:集成電路 (IC) >> 嵌入式 - 微控制器，系列:M683xx 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位速度:16MHz 連通性:SIO 外圍設備:- 輸入/輸出數:32 程序存儲器容量:8KB（8K x 8）程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數據轉換器:- 振蕩器型:外部工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件其它名稱:864285

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