參數(shù)資料
型號(hào)： M37735EHB
廠商： Mitsubishi Electric Corporation
英文描述： PROM VERSION OF M37735EHBXXXFP
中文描述： PROM的版本M37735EHBXXXFP
文件頁數(shù)： 6/34頁
文件大?。?/td> 591K
代理商： M37735EHB
6
MITSUBISHI MICROCOMPUTERS
M37735EHBXXXFP
M37735EHBFS
PROM VERSION OF M37735MHBXXXFP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig. 1 Bit configuration of oscillation circuit control register 1 (corresponding to Figure 63 in data sheet “M37735MHBXXXFP”)
Fig. 2 How to write data in oscillation circuit control register 1 (indentical with Figure 64 in data sheet “M37735MHBXXXFP”)
Writing data “80
16
” (LDM instruction)
Reset clock prescaler
Writing data “55
16
” (LDM instruction)
Writing data “0Y
16
” (LDM instruction)
CC
2
to CC
0
selection bits
How to reset clock prescaler
How to write in CC
2
to CC
0
selection bits
Note.
“Y” is the sum of bits to be set. For example,
when
setting bits 2 and 1 to “1”, “Y” becomes “6”.
Next instruction
BASIC FUNCTION BLOCKS
The M37735EHBXXXFP has the same functions as the
M37735MHBXXXFP except for the following:
(1) The built-in ROM is PROM.
(2) The status of bit 3 of the oscillation circuit control register 1 (address
6F
16
) at a reset is different.
(3) The usage condition of bit 3 of the oscillation circuit control register
1 is different.
(4) Part of the processor mode selection method is different.
Accordingly, refer to the basic function blocks description in the
M37735MHBXXXFP except for Figure 1 (bit configuration of
oscillation circuit control register 1), Figure 3 (microcomputer internal
status during reset), and Table 1 (microprocessor mode selection
method).
In the M37735EHBXXXFP, bit 3 of the oscillation circuit control register
1 must be “0”. (Refer to Figure 1.) Bit 3 is “1” at a reset. Accordingly,
write “0” to bit 3 in the single-chip mode after reset.
Figure 2 shows how to write data in oscillation circuit control register
1.
In the M37735EHBXXXFP, the microprosessor mode cannot be
selected by connecting the CNV
SS
pin to V
CC
. Connect the CNV
SS
pin to V
SS
and start the microcomputer’s operating from the single-
chip mode.
Note.
Write to the oscillation circuit control
register 1 as the flow shown in Figure 2.
Oscillation circuit control register 1
Main clock division selection bit
0 : Main clock is divided by 2.
1 : Main clock is not divided by 2.
Main clock external input selection bit
0 : Main-clock oscillation circuit is operating by itself.
Watchdog timer is used at returning from STP state.
1 : Main-clock is input externally.
Watchdog timer is not used at returning from STP state.
Sub clock external input selection bit
0 : Sub-clock oscillation circuit is operating by itself.
Port P7
functions as X
pin.
Watchdog timer is used at returning from STP state.
1 : Sub-clock is input externally.
Port P7
functions as I/O port.
Watchdog timer is not used at returning from STP state.
0 : Always “0” (This bit is “1” at reset, so that write this bit to “0”.)
0 : Always “0” (However, writing data “55
16
” shown in Figure 2 is possible.)
Clock prescaler reset bit
Address
6F
16
CC
0
CC
1
CC
2
0
0
7
6
5
4
3
2
1
0
Table 1. Relationship between CNV
SS
pin input level and processor
modes
Mode
· Single-chip
· Memory expansion
· Microprocessor
V
SS
Description
Single-chip mode upon starting
after reset. Each mode can be
selected by changing the
processor mode bits by software.
CNV
SS
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