參數(shù)資料
型號: MC68HC11K1
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數(shù): 13/20頁
文件大?。?/td> 286K
代理商: MC68HC11K1
AN1242/D
MOTOROLA
13
A few small differences in I/O functionality should be noted:
I/O ports on some M68HC11 devices have assignable pull-up resistors. For example, the PPAR reg-
ister at $002C on M68HC11K MCUs can enable pull-up devices on Ports G and H in all modes and
on Ports B and F only in single-chip mode. This feature is not available on PSD4XX or PSD5XX de-
vices, so external pull-ups may be needed.
I/O Ports B, C, and F on M68HC11K MCUs do not have any sort of control or alternate function reg-
isters, although Port C can be placed in open drain mode with the CWOM bit in the OPT2 register at
$0038. If this functionality must be maintained, replace Port C on the MC68HC711K4 with PSD4XX
or PSD5XX Port D. The open drain control register (PD_OPN_DRN in the table above) allows each
PSD Port D I/O pin to be configured for normal or open drain mode.
The PGAR register at $002D is used to enable the memory expansion address lines associated with
Port G bits 0 to 5. Setting bits in this register to 1 overrides the Port G I/O functions and enables the
associated XA lines. This register is set to $00 after reset.
Chip select control registers CSCTL, GPCS1A, and GPCS2A, located respectively at $005B, $005C,
and $005E, override the I/O functions of Port H bits 4 to 7. In expanded operating mode, GPCS1A
and GPCS2A are set to $00 after reset, thus disabling general purpose chip selects 1 and 2 (CSGP1
and CSGP2). CSCTL will be set to $04 after reset, leaving the I/O chip select (CSIO) disabled and
the program chip select (CSPROG) enabled. Write CSCTL to $00 to disable CSPROG and make the
PH7/CSPROG pin available for I/O. CSPROG is not required for interfacing to the PSD, although it
can be used in conjunction with the PSD power management unit (PMU) to reduce power consump-
tion.
The code examples that follow demonstrate how the PSD I/O ports are accessed in comparison with
M68HC11 I/O ports. Access to the other PSD control registers is achieved in the same straightforward fash-
ion. Please refer to PSD4XX and PSD5XX documentation for more information.
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