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參數資料
| 型號： | UPD784218Y |
| 廠商： | NEC Corp. |
| 英文描述： | 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16-/8-bit的單晶片微控制器 |
| 文件頁數： | 32/92頁 |
| 文件大?。?/td> | 617K |
| 代理商： | UPD784218Y |
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μ
PD784218, 784218Y
Data Sheet U12304EJ2V0DS00
32
Table 8-1. 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
—
8.2 Clock Generator
An on-chip clock generator necessary for operation is provided. This clock generator has a frequency divider.
If high-speed operation is not necessary, the internal operating frequency can be lowered by the frequency divider
to reduce the current consumption.
Figure 8-2. Clock Generator Block Diagram
XT2
XT1
X1
X2
STOP, bit 2 of standby
control register (STBC)
(MCK) = 1 when
subsystem clock is
selected as CPU clock
Main system
clock
oscillator
IDLE
controller
Subsystem
clock
oscillator
f
XT
Watch timer,
clock output
function
Clock to
peripheral
hardware
CPU
clock
(f
CPU
)
Frequency
divider
Prescaler
Prescaler
STOP,
IDLE
controller
HALT
controller
f
X
f
X
2
f
XX
2
f
XX
2
2
f
XX
2
3
f
XX
S
S
Internal system
clock (f
CLK
)
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