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參數(shù)資料
| 型號(hào)： | μPD784215 |
| 廠商： | NEC Corp. |
| 英文描述： | 8/16 Bit Single Chip Microcontrollers(8/16 位單片微控制器) |
| 中文描述： | 8 / 16位單片機(jī)微控制器（8 / 16位單片微控制器） |
| 文件頁(yè)數(shù)： | 32/88頁(yè) |
| 文件大?。?/td> | 427K |
| 代理商： | ΜPD784215 |
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μ
PD784214,784215,784216
32
Table 7-1. Port Functions
Port Name
Pin Name
Function
Specification of Pull-up Resistor
Connection by Software
Port 0
P00 to P06
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 1
P10 to P17
Input port
—
Port 2
P20 to P27
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 3
P30 to P37
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 4
P40 to P47
Can be set in input or output mode in 1-bit units
Can directly drive LEDs
Can be specified in 1-port units
Port 5
P50 to P57
Can be set in input or output mode in 1-bit units
Can directly drive LEDs
Can be specified in 1-port units
Port 6
P60 to P67
Can be set in input or output mode in 1-bit units
Can be specified in 1-port units
Port 7
P70 to P72
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 8
P80 to P87
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 9
P90 to P95
N-ch open drain I/O port
Can be set in input or output mode in 1-bit units
Can directly drive LEDs
—
Port 10
P100 to P103
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 12
P120 to P127
Can be set in input or output mode in 1-bit units
Can be specified in 1-bit units
Port 13
P130, P131
Can be set in input or output mode in 1-bit units
—
7.2 Clock Generation Circuit
An on-chip clock generation circuit necessary for operation is provided. This clock generation circuit has a divider
circuit. If high-speed operation is not necessary, the internal operating frequency can be lowered by the divider
circuit to reduce the current consumption.
Figure 7-2. Block Diagram of Clock Generation Circuit
XT2
XT1
X1
X2
STOP
Main system
clock
oscillator
Subsystem
clock
oscillator
f
XT
Watch timer,
clock output function
Clock to
peripheral hardware
CPU
clock
(f
CPU
)
Frequency
divider
Prescaler
Prescaler
Standby
control
circuit
Wait
control
circuit
f
X
f
X
2
f
XX
2
f
XX
2
2
f
XX
2
3
f
XX
S
S
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