参数资料
型号: MB89636RPF
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP64
封装: PLASTIC, QFP-64
文件页数: 32/153页
文件大小: 7326K
代理商: MB89636RPF
MB89630 SERIES HARDWARE MANUAL
3-8
3.4 MEMORY ACCESS MODE
When external access is enabled by setting bits 2 to 0 of the mode data at address FFFD
H,
the
areas in Figure 3.4 are externally accessed via the P0 to P2 pins.
Fig. 3.18 Memory Map in Various Modes
As shown in Figure 3.5, when accessing by the external pins, specify the address of the external peripheral/
memory to be accessed according to the access information to be output to the address and address-data
pins. The lower 8 bits of the address are input and output by time-sharing with the data bus. Therefore, the
external circuit should be created so that the address information can be latched at the falling edge of the
ALE signal to be output to the ALE pin. For access, when reading, input data from the external peripheral/
memory to the data pin in synchronization with the read strobes to be output to the RD pin; when writing,
write the data to be output to the data pin to the external peripheral/memory in synchronization with the
write strobes to be output to the WR pin.
Fig. 3.19 External-access Timing Chart
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