参数资料
型号: M37902FCCHP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 26 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 62/143页
文件大小: 1148K
代理商: M37902FCCHP
M37902FCCHP, M37902FGCHP, M37902FJCHP
25
MITSUBISHI MICROCOMPUTERS
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Fig. 17 Bus cycle waveform at access to internal area
1 bus cycle = 3
φ (Note)
(Internal ROM bus cycle select bit = 0)
ROM
RAM
SFR
Internal address bus
Internal data bus
Internal code bus
φBIU
Address
1 bus cycle = 2
φ
φBIU
Internal address bus
Internal data bus
Internal code bus
Address
1 bus cycle = 2
φ
1 bus cycle = 2
φ
(Internal ROM bus cycle select bit = 1)
φBIU
Internal address bus
Internal data bus
Internal code bus
Address
Data
1 bus cycle = 3
φ
Data
Note: When reprogramming the internal flash memory in the CPU reprogramming mode, select the bus cycle = 3
φ.
q Number of bus cycles
Figure 17 shows the bus cycle waveform at access to the internal
area. Bit 7 of the processor mode register 1 (address 5F16) selects
the number of bus cycles for the internal ROM: 3
φ or 2φ. (This bit 7 is
the internal ROM bus cycle select bit.) The internal RAM, SFRs (in-
ternal peripheral devices’ control registers) are always accessed with
1 bus cycle = 2
φ. Figure 18 shows the bus cycle waveform at access
to the external area. The bus cycle select bits 0, 1 (See the note in
___
Figure 18.) select the number of the bus cycles for each CSi area
from 8 types of numbers.
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