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參數(shù)資料
| 型號： | UPD17149GTA1 |
| 廠商： | NEC Corp. |
| 英文描述： | SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 小，通用4位單晶片微控制器 |
| 文件頁數(shù)： | 56/102頁 |
| 文件大?。?/td> | 408K |
| 代理商： | UPD17149GTA1 |
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56
μ
PD17145(A1), 17147(A1), 17149(A1)
17. STANDBY FUNCTION
17.1 Outline of Standby Function
The current dissipation of the
μ
PD17149(A1) can be reduced by using the standby function. This function
can be effected in two modes: STOP and HALT.
The STOP mode stops the system clock. In this mode, the current dissipation by the CPU is minimized with
only leakage current flowing. The CPU therefore does not operate, but the contents of the data memory are
retained.
In the HALT mode, oscillation of the clock continues. However, supply of the clock to the CPU is stopped.
Therefore, the CPU stops operating. This mode cannot reduce the current dissipation as much as the STOP
mode. However, because the system clock continues oscillating, the operation can be started immediately after
the HALT mode has been released. In both the STOP and HALT modes, the statuses of the data memory,
registers, and the output latches of the output ports immediately before the standby mode is set are retained
(except STOP 0000B). Therefore, set the port status so that the current dissipation of the entire system is
reduced before the standby mode is set.
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