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| 型號(hào)： | CR16HCT9 |
| 文件頁(yè)數(shù)： | 10/157頁(yè) |
| 文件大?。?/td> | 1256K |
| 代理商： | CR16HCT9 |
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10
4.1
Some pins have alternate functions which may be enabled.
These pins can be individually configured as general pur-
pose pins, even when the module they belong to is enabled.
PIN DESCRIPTION
The following is a brief description of all device pins.
Table 2
Input Pins
Signal
Type
Active
Pin (* for a shared pin)
Function
X1CKI
OSC
High
Main oscillator clock input.
X2CKI
OSC
High
32kHz oscillator clock input.
RESET
CMOS
Low
Chip general reset pin. Schmitt trigger input, asynchronous.
ISE
CMOS
Low
Interrupt input for development system.
T1B
CMOS
Prog.
*
Timer 1 input B. Shares pin with I/O port pin PF1.
T2B
CMOS
Prog.
*
Timer 2 input B. Shares pin with I/O port pin PF5.
RDX1
CMOS
High
*
USART 1 receive data input. Shares pin with I/O port pin PG5.
RDX2
CMOS
High
*
USART 2 receive data input. Shares pin with I/O port pin PG0.
ACH0
Analog
*
A2D converter channel 0. Shares pin with I/O port pin PI0
ACH1
Analog
*
A2D converter channel 1. Shares pin with I/O port pin PI1
ACH2
Analog
*
A2D converter channel 2. Shares pin with I/O port pin PI2
ACH3
Analog
*
A2D converter channel 3. Shares pin with I/O port pin PI3
ACH4
Analog
*
A2D converter channel 4. Shares pin with I/O port pin PI4
ACH5
Analog
*
A2D converter channel 5. Shares pin with I/O port pin PI5
ACH6
Analog
*
A2D converter channel 6. Shares pin with I/O port pin PI6
ACH7
Analog
*
A2D converter channel 7. Shares pin with I/O port pin PI7
ACH8
Analog
*
A2D converter channel 8. Shares pin with I/O port pin PH0
ACH9
Analog
*
A2D converter channel 9. Shares pin with I/O port pin PH1
ACH10
Analog
*
A2D converter channel 10. Shares pin with I/O port pin PH2
ACH11
Analog
*
A2D converter channel 11. Shares pin with I/O port pin PH3
MWCS
CMOS
Low
*
SPI/MICROWIRE slave select. Shares pin with I/O port pin PH4.
NMI
CMOS
Low
External non-maskable interrupt.
ENV0
CMOS
Low
*
Strap to select operating environment.
ENV1
CMOS
Low
*
Strap pin to select operating environment.
ENV2
CMOS
Low
Strap pin to select operating environment.
CANRx
CMOS
High
CAN receive data input.
Table 3
Output Pins
Signal
Type
Active
Pin (* for
a shared pin)
Function
X1CKO
OSC
High
Main oscillator clock output.
X2CKO
OSC
High
32kHz oscillator clock output.
CLK
CMOS High
*
External reference clock for development environment (shared with ENV1).
CLKOUT
1
CMOS High
*
Clock output generated through prescaler (shared with ENV0).
CLKOUT
2
CMOS High
*
Clock output generated through prescaler (shared with ENV1).
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