参数资料
型号: MC68HC705J1ACP
厂商: Freescale Semiconductor
文件页数: 135/162页
文件大小: 0K
描述: IC MCU 4MHZ 1.2K OTP 20-DIP
标准包装: 18
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 14
程序存储器容量: 1.2KB(1.2K x 8)
程序存储器类型: OTP
RAM 容量: 64 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-DIP(0.300",7.62mm)
包装: 管件
Technical Data
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
Resets and Interrupts
The CPU clears the IRQ latch during interrupt processing, so that
another interrupt signal on the IRQ/VPP pin can latch another interrupt
request during the interrupt service routine. As soon as the I bit is cleared
during the return from interrupt, the CPU can recognize the new interrupt
request. Figure 4-4 shows the IRQ/VPP pin interrupt logic.
Figure 4-4. External Interrupt Logic
Setting the I bit in the condition code register disables external interrupts.
The port A external interrupt bit (PIRQ) in the mask option register
enables pins PA0–PA3 to function as external interrupt pins.
The external interrupt sensitivity bit (LEVEL) in the mask option register
controls interrupt triggering sensitivity of external interrupt pins. The
IRQ/VPP pin can be negative-edge triggered only or negative-edge and
low-level triggered. Port A external interrupt pins can be positive-edge
triggered only or both positive-edge and high-level triggered. The
level-sensitive triggering option allows multiple external interrupt
sources to be wire-ORed to an external interrupt pin. An external
interrupt request, shown in Figure 4-5, is latched as long as any source
is holding an external interrupt pin low.
PIRQ
LEVEL-SENSITIVE TRIGGER
PA3
PA2
PA1
IRQ
PA0
VDD
(MOR LEVEL BIT)
RESET
IRQ VECTOR FETCH
EXTERNAL
INTERRUPT
REQUEST
(MOR)
TO BIH & BIL
INSTRUCTION
PROCESSING
IRQF
IRQR
IRQE
DQ
CK
IRQ
CLR
LATCH
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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