參數(shù)資料
型號: M30240M3
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機(jī)
文件頁數(shù): 80/142頁
文件大?。?/td> 1637K
代理商: M30240M3
1-80
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
Timer B
2.22 Timer B
Figure 1.70 shows the block diagram of timer B. Figure 1.71 and Figure 1.72 show the timer B-related
registers. Use the timer Bi mode register (i = 0 to 2) bits 0 and 1 to choose the desired mode. Timer B
works in Timer mode only (i.e., the timer counts an in internal count source).
Figure 1.70: Block diagram of Timer B
Figure 1.71: Timer B-related registers
Clock source selection
(address 0380
16
)
Reload register (16)
Low-order 8 bits
High-order 8 bits
Data bus low-order bits
Data bus high-order bits
f
1
f
8
f
32
Count start flag
Counter reset circuit
Counter (16)
Address
0391
16
0390
16
0393
16
0392
16
0395
16
0394
16
TBi
Timer B0
Timer B1
Timer B2
TBj
Timer B2
Timer B0
Timer B1
TBj overflow
(j=i - 1. Note, however,
j = 2 when i = 0)
Note 1: Timer B0.
Note 2: Timer B1, Timer B2.
Timer Bi mode register
Symbol
TBiMR(i=0 to 2)
Address
When reset
00XX0000
2
039B
16
to 039D
16
Bit name
Function
Bit symbol
W
R
b7
b6
b5
b4
b3
b2
b1
0
b0
0
Operation mode select bit
0 0 : Timer mode
b1 b0
TMOD1
TMOD0
MR0
Invalid in timer mode
Can be “0” or “1”
MR2
MR1
MR3
0 0 : f
1
0 1 : f
8
1 0 : f
32
1 1 : Reserved
TCK1
TCK0
Count source select bit
Invalid in timer mode.
This bit can neither be set nor reset. When read in timer mode,
its content is indeterminate.
0 (Fixed to “0” in timer mode ; i = 0)
Nothing is assiigned (i = 1, 2).
This bit can neither be set nor reset. When read, its content is indeterminate.
(Note 1)
(Note 2)
b7 b6
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