参数资料
型号: MC68LNC705C9ACFN
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 97/177页
文件大小: 1941K
代理商: MC68LNC705C9ACFN
General Description
Advance Information
MC68HC705C9A — Rev. 4.0
26
General Description
MOTOROLA
1.5 Mask Options
The following two mask option registers are used to select features
controlled by mask changes on the MC68HC05C9A and the
MC68HC05C12A:
Port B mask option register (PBMOR)
C12 mask option register (C12MOR)
The mask option registers are EPROM locations which must be
programmed prior to operation of the microcontroller.
1.5.1 Port B Mask Option Register (PBMOR)
The PBMOR register, shown in Figure 1-2, contains eight
programmable bits which determine whether each port B bit (when in
input mode) has the pullup and interrupt enabled. The port B interrupts
share the vector and edge/edge-level sensitivity with the IRQ pin. For
PBPU7–PBPU0 — Port B Pullup/Interrupt Enable Bits
1 = Pullup and CPU interrupt enabled
0 = Pullup and CPU interrupt disabled
NOTE:
The current capability of the port B pullup devices is equivalent to the
MC68HC05C9A, which is less than the MC68HC05C12A.
$3FF0
Bit 7
6
54321
Bit 0
PBPU7
PBPU6
PBPU5
PBPU4
PBPU3
PBPU2
PBPU1
PBPU0
Figure 1-2. Port B Mask Option Register
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