參數(shù)資料
型號: MC68HC05L16CFU
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, QFP-80
文件頁數(shù): 72/146頁
文件大?。?/td> 852K
代理商: MC68HC05L16CFU
Option Map for I/O Configurations
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
31
2.4.1 Resistor Control Register 1
Bits 7–4 — Reserved
These bits are not used and always read as logic 0.
RBH — Port B Pullup Resistor (H)
When this bit is set, pullup resistors are connected to the upper four bits of port B. This bit is cleared
on reset.
RBL — Port B Pullup Resistor (L)
When this bit is set, pullup resistors are connected to the lower four bits of port B. This bit is cleared
on reset.
RAH — Port A Pullup Resistor (H)
When this bit is set, pullup resistors are connected to the upper four bits of port A. This bit is cleared
on reset.
RAL — Port A Pullup Resistor (L)
When this bit is set, pullup resistors are connected to the lower four bits of port A. This bit is cleared
on reset.
2.4.2 Resistor Control Register 2
RCx — Port C Pullup Resistor (Bitx)
When RCx bit is set, the pullup resistor is connected to the corresponding bit of port C. This bit is
cleared on reset.
Address:
Option Map — $0008
Bit 7
654321
Bit 0
Read:
0000
RBH
RBL
RAH
RAL
Write:
Reset:
00000000
Figure 2-5. Resistor Control Register 1 (RCR1)
Address:
Option Map — $0009
Bit 7
654321
Bit 0
Read:
RC7
RC6
RC5
RC4
RC3
RC1
RC0
Write:
Reset:
00000000
Figure 2-6. Resistor Control Register 2 (RCR2)
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