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| 型号： | M306H2MC-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP116 |
| 封装： | 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116 |
| 文件页数： | 18/32页 |
| 文件大小： | 2643K |
| 代理商： | M306H2MC-XXXFP |
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SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
with DATA ACQUISITION CONTROLLER
MITSUBISHI MICROCOMPUTERS
25
Rev. 1.0
M306H2MC-XXXFP
2.4.2 Bus Control
The following explains the signals required for accessing external devices and software waits.
The signals required for accessing the external devices are valid when the processor mode is set to
memory expansion mode and microprocessor mode. The software waits are valid in all processor modes.
(1) Address bus/data bus
The address bus consists of the 20 pins A0 to A19 for accessing the 1M bytes of address space.
The data bus consists of the pins for data I/O. When the BYTE pin is “H”, the 8 ports D0 to D7 function
as the data bus. When BYTE is “L”, the 16 ports D0 to D15 function as the data bus.
When a change is made from single-chip mode to memory expansion mode, the value of the address
bus is undefined until external memory is accessed.
(2) Chip select signal
The chip select signal is output using the same pins asP4 4 to P47. Bits 0 to 3 of the chip select
control register (address 000816) set each pin to function as a port or to output the chip select signal.
The chip select control register is valid in memory expansion mode and microprocessor mode. IN
single-chip mode,P4 4 to P47 function as programmable I/O ports regardless of the value in the chip
select control register.
_______
In microprocessor mode, only CS0 outputs the chip select signal after the reset state has been
_______
cancelled. CS1 to CS3 function as input ports. Figure 2.4.3 shows the chip select control register.
The chip select signal can be used to split the external area. Tables 2.4.3 show the external memory
areas specified using the chip select signal.
Figure 2.4.3 Chip select control register
Processor mode
Chip select signal
CS0
Memory expansion
mode
CS1
2800016 to
2FFFF16
(32K bytes)
3000016 to
CFFFF16
(640K bytes)
CS3
0400016 to
07FFF16
(16K bytes)
Microprocessor mode
3000016 to
FFFFF16
(832K bytes)
CS2
0800016 to
27FFF16
(128K bytes)
Table 2.4.3 External areas specified by the chip select signals
W
Function
Bit symbol
Bit name
Chip select control register
SymbolAddress
When reset
CSR000816
0116
R
b7b6b5b4b3b2b1b0
CS0
0 : Chip select output disabled
(Normal port pin)
1 : Chip select output enabled
CS0 output enable bit
CS1
CS3W
CS3 wait bit
CS0W
CS0 wait bit
CS2
CS2 output enable bit
CS1 output enable bit
0 : Wait state inserted
1 : No wait state
CS2W
CS2 wait bit
CS2W
CS1 wait bit
CS3
CS3 output enable bit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M306H2T-RPD-E | 制造商:Renesas Electronics Corporation 功能描述:EMULATION POD, M16C6H GROUP (M306H2) - Bulk |
| M306H3FCFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER |
| M306H3FCFP#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 16BIT R8C CISC 128KB FLASH 5V 116LQFP - Trays |
| M306H3MC-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER |
| M306H5FGFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER |
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