CHAPTER 19 IEBus CONTROLLER (V850/SB2)
User’s Manual U13850EJ4V0UM
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(4) IEBus partner address register (PAR)
(a) When slave unit
The value of the receive data in the master address field (address of the master unit) is written to this
register.
If a request “4H” to read the lock address (lower 8 bits) is received from the master, the CPU must read
the value of this register, and write it to the lower 8 bits IEBus data register (DR).
If a request “5H” to read the lock address (higher 4 bits) is received from the master, the CPU must read
the value of this register and write the data of the higher 4 bits to DR.
Sets the partner address (12 bits) to bits 11 to 0.
Figure 19-14. IEBus Partner Address Register (PAR) Format
15
0
14
0
13
0
12
0
PAR
11 10
9
8
7
6
5
4
3
2
1
0
Address
FFFFF3E6H
After reset
0000H
R/W
R
(5) IEBus control data register (CDR)
(a) When master unit
The data of the lower 4 bits is reflected in the data transmitted in the control field. During master request,
this register must be set in advance before starting communication.
(b) When slave unit
The data received in the control field is written to the lower 4 bits.
When the status transmission flag (STATUS) of the IEBus interrupt status register (ISR) is set, an
interrupt (INTIE2) is issued, and each processing should be performed by software, according to the
value of the lower 4 bits of CDR.
Содержание MPD703030A
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