參數(shù)資料
型號： MC16S2CPU20B1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, 20.97 MHz, MICROCONTROLLER, PQFP100
封裝： TQFP-100
文件頁數(shù)： 37/104頁
文件大?。?/td> 812K
代理商： MC16S2CPU20B1
MOTOROLA
MC68HC16S2
38
MC68HC16S2TS/D
A write to the port F data register is stored in the internal data latch, and if any port F pin is configured
as an output, the value stored for that bit is driven onto the pin. A read of the port F data register returns
the value at the pin only if the pin is configured as a discrete input. Otherwise, the value read is the value
stored in the register.
The port F data register is a single register that can be accessed in two locations. When accessed at
$YFFA19, the register is referred to as PORTF0; when accessed at $YFFA1B, the register is referred
to as PORTF1. The register can be read or written at any time. It is unaffected by reset.
The bits in this register control the direction of the pin drivers when the pins are configured as I/O. Any
bit in this register set to one configures the corresponding pin as an output. Any bit in this register
cleared to zero configures the corresponding pin as an input. This register can be read or written at any
time.
The bits in this register control the function of each port F pin. Any bit cleared to zero defines the corre-
sponding pin to be an I/O pin. Any bit set to one defines the corresponding pin to be an interrupt request
signal or MODCLK. The MODCLK signal has no function after reset. Table 30 shows port F pin assign-
ments.
Table 29 Port E Pin Assignments
PEPAR Bit
Port E Signal
Bus Control Signal
PEPA7
PE7
SIZ1
PEPA6
PE6
SIZ0
PEPA5
PE5
AS
PEPA4
PE4
DS
PEPA3
PE3
—
PEPA2
PE2
AVEC
PEPA1
PE1
DSACK1
PEPA0
PE0
DSACK0
PORTF0, PORTF1 — Port F Data Register
$YFFA19, YFFA1B
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0
RESET:
U
DDRF — Port F Data Direction Register
$YFFA1D
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
DDF7
DDF6
DDF5
DDF4
DDF3
DDF2
DDF1
DDF0
RESET:
0
PFPAR — Port F Pin Assignment Register
$YFFA1F
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
PFPA7
PFPA6
PFPA5
PFPA4
PFPA3
PFPA2
PFPA1
PFPA0
RESET:
DATA9
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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