參數(shù)資料
型號(hào): MB89635RP-SH
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP64
封裝: SHRINK, DIP-64
文件頁數(shù): 103/153頁
文件大小: 7326K
代理商: MB89635RP-SH
MB89630 SERIES HARDWARE MANUAL
2-30
P20 to P27 CMOS-type output-only ports (also used as external-bus control pin)
Operation when external bus extended
See the description of the bus functions.
Operation for output port
In the single-chip mode, the value written at the PDR is output to the pin. When the PDR is read, the
con tents of the output latch are always read, so the bit- processing instruction is used even if the output
level changes due to the load.
State when reset
In the single-chip mode, the pin impedance goes High at reset. As soon as a vector is fetched, output of
the port is enabled and the port starts operation as the output port. Since the PDR is initialized to 0 by
resetting, the Low level is output to the pin.
State in stop mode
With the SPL bit of the standby-control register set to 1, in the stop mode, the output impedance goes
High irrespective of the value of the PDR.
Fig. 2.10 Port 2 (in Single-chip Mode)
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