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參數(shù)資料
| 型號： | M34570EDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO36 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 53/69頁 |
| 文件大小： | 687K |
| 代理商： | M34570EDFP |
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Under
development
Preliminary Specifications REV.1.02
Specifications in this manual are tentative and subject to change.
Mitsubishi Microcomputers
M32C/83 group
SINGLE-CHIP 16/32-BIT CMOS MICROCOMPUTER
58
Bus
(4) Bus Timing
Bus cycle for the internal ROM and internal RAM are basically one BCLK cycle. When the PM12 bit in the
PM1 register is set to "1" (wait), the bus cycles are two BCLK cycles.
Bus cycles for the SFR is basically two BCLK cycles. When the PM13 bit in the PM1 register is set to "1"
(2 waits), the bus cycles are three BCLK cycles. When accessing CAN-associated registers (addresses
01E016 to 024516), the PM13 bit should be set to "1".
Bus cycle for an external space is basically one BCLK cycle. The WCR register inserts wait(s), equivalent
to one to three BCLK cycles, into an external space. Bus cycles are two BCLK cycles if selecting one
wait. Bus cycles are four BCLK cycles if selecting three waits.
If applicable to the followings, bus cycles vary from the ones selected by the WCR register. Figure1.7.5
shows each bit status and bus cycle.
Write cycle with a separate bus and no wait.
Read cycle and write cycle with a multiplex bus and no wait.
Read cycle and write cycle with a multiplex bus and one wait.
Figure 1.7.3 shows the WCR register. Figures 1.7.4 and 1.7.5 show bus timing in an external space.
Figure 1.7.3. WCR Register
Notes :
1. With a multiplex bus, the WCR register must be two waits even if setting it to "002" (no wait) or
"012" (one wait).
2. With a separate bus, the read bus cycle is one BCLK cycle and the write bus cycle is two BCLK
cycles (one wait) when setting the WCR register to "002".
Symbol
Address
When reset
WCR
000816
1111 11112
Wait control register 1,2
RW
WCR0
WCR1
WCR2
WCR3
WCR4
WCR5
WCR6
WCR7
0 0: No wait
0 1: 1 wait
1 0: 2 waits
1 1: 3 waits
0 0: No wait
0 1: 1 wait
1 0: 2 waits
1 1: 3 waits
0 0: No wait
0 1: 1 wait
1 0: 2 waits
1 1: 3 waits
0 0: No wait
0 1: 1 wait
1 0: 2 waits
1 1: 3 waits
Bit name
Function
Bit
symbol
External space 0
wait bit
External space 1
wait bit
External space 2
wait bit
External space 3
wait bit
b7
b6
b5
b4
b3
b2
b1
b0
b1 b0
b3 b2
b5 b4
b7 b6
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