參數(shù)資料
型號(hào): MC68HC08LT8CFGE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù): 5/156頁
文件大小: 1107K
代理商: MC68HC08LT8CFGE
Input/Output (I/O) Ports
MC68HC08LT8 Data Sheet, Rev. 1
102
Freescale Semiconductor
When DDRCx is a logic 1, reading address $0002 reads the PTCx data latch. When DDRCx is a logic 0,
reading address $0002 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit. Table 9-4 summarizes the operation of the port C pins.
9.5 Port D
Port D is an 8-bit special function port that shares all of its port pins with the liquid crystal display (LCD)
driver module.
9.5.1 Port D Data Register (PTD)
The port D data register contains a data latch for each of the eight port D pins.
PTD[7:0] — Port D Data Bits
These read/write bits are software programmable. Data direction of each port D pin is under the control
of the corresponding bit in data direction register D. Reset has no effect on port D data.
FP[18:11] — LCD Driver Frontplanes 18–11
FP[18:11] are pins used for the frontplane output of the LCD driver module. The enable bit, PDE, in
the CONFIG2 register and LCDE bit in the LCDCR register, determines whether the
PTD7/FP18–PTD0/FP11 pins are LCD frontplane driver pins or general-purpose I/O pins. See Chapter
Table 9-4. Port C Pin Functions
DDRC
Bit
PTC Bit
I/O Pin Mode
Accesses to DDRC
Accesses to PTC
Read/Write
Read
Write
0
X(1)
1. X = don’t care.
Input, Hi-Z(2)
2. Hi-Z = high impedance.
DDRC[7:0]
Pin
PTC[7:0](3)
3. Writing affects data register, but does not affect input.
1
X
Output
DDRC[7:0]
PTC[7:0]
Address:
$0003
Bit 76
5
4
3
2
1Bit 0
Read:
PTD7
PTD6
PTD5
PTD4
PTD3
PTD2
PTD1
PTD0
Write:
Reset:
Unaffected by reset
Alternative Function:
FP18
FP17
FP16
FP15
FP14
FP13
FP12
FP11
Figure 9-12. Port D Data Register (PTD)
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