參數(shù)資料
型號(hào)： UPD780024AGB-xxx-8EU
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 36/96頁
文件大?。?/td> 661K
代理商： UPD780024AGB-XXX-8EU
36
μ
PD780021A, 780022A, 780023A, 780024A, 780021AY, 780022AY, 780023AY, 780024AY
Data Sheet U14042EJ4V0DS
7. EXTERNAL DEVICE EXPANSION FUNCTION
The external device expansion function is for connecting external devices to areas other than the internal ROM,
RAM, and SFR areas. Ports 4 to 6 are used for external device connection.
8. STANDBY FUNCTION
The following two standby modes are available for further reduction of system power consumption.
HALT mode: In this mode, the CPU operation clock is stopped. The average power consumption can be
reduced by intermittent operation by combining this mode with the normal operation mode.
STOP mode: In this mode, oscillation of the main system clock is stopped. All the operations performed on
the main system clock are suspended, and only the subsystem clock is used, resulting in
extremely small power consumption. This can be used only when the main system clock is
operating (the subsystem clock oscillation cannot be stopped).
Figure 8-1. Standby Function
Note
The power consumption can be reduced by stopping the main system clock. When the CPU is operating
on the subsystem clock, set bit 7 (MCC) of the processor clock control register (PCC). The STOP instruction
cannot be used.
Caution When the main system clock is stopped and the device is operating on the subsystem clock, wait
until the oscillation stabilization time has been secured by the program before switching back to
the main system clock.
9. RESET FUNCTION
The following two reset methods are available.
External reset by RESET signal input
Internal reset by watchdog timer program loop time detection
10. MASK OPTION
Table 10-1 Pin Mask Option Selection
Subseries Name
μ
PD780024A Subseries
Pins
Mask Option
P30 to P33
An on-chip pull-up resistor can be specified in 1-bit units.
μ
PD780024AY Subseries
P30 and P31
The mask option can be used to specify the connection of an on-chip pull-up resistor to P30 to P33
Note
, in 1-bit units.
Note
The
μ
PD780024AY Subseries has P30 and P31 only.
Main system clock
operation
STOP mode
Main system clock
operation is stopped
Interrupt
request
Interrupt
request
HALT
instruction
HALT
instruction
Interrupt
request
STOP
instruction
CSS = 1
CSS = 0
Subsystem clock
operation
Note
HALT mode
HALT mode
Note
Clock supply for CPU is stopped,
oscillation is maintained
Clock supply for CPU is stopped,
oscillation is maintained
相關(guān)PDF資料
PDF描述
UPD780024ACW-xxx Circular Connector; No. of Contacts:55; Series:JTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle
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