Microchip Technology DV164136 Data Sheet
PIC18F87J11 FAMILY
DS39778E-page 178
2007-2012 Microchip Technology Inc.
12.2.3
ADDRESSABLE PARALLEL SLAVE
PORT MODE
PORT MODE
In the Addressable Parallel Slave Port mode
(
PMMODEH<1:0> = 01), the module is configured with
two extra inputs, PMA<1:0>, which are the Address
Lines 1 and 0. This makes the 4-byte buffer space
directly addressable as fixed pairs of read and write
buffers. As with Buffered Legacy mode, data is output
from PMDOUT1L, PMDOUT1H, PMDOUT2L and
PMDOUT2H, and is read in PMDIN1L, PMDIN1H,
PMDIN2L and PMDIN2H.
Lines 1 and 0. This makes the 4-byte buffer space
directly addressable as fixed pairs of read and write
buffers. As with Buffered Legacy mode, data is output
from PMDOUT1L, PMDOUT1H, PMDOUT2L and
PMDOUT2H, and is read in PMDIN1L, PMDIN1H,
PMDIN2L and PMDIN2H.
shows the buffer
addressing for the incoming address to the input and
output registers.
output registers.
TABLE 12-2:
SLAVE MODE BUFFER
ADDRESSING
ADDRESSING
FIGURE 12-6:
PARALLEL MASTER/SLAVE CONNECTION ADDRESSED BUFFER EXAMPLE
PMADDR
<1:0>
Output Register
(Buffer)
Input Register
(Buffer)
00
PMDOUT1L (0)
PMDIN1L (0)
01
PMDOUT1H (1)
PMDIN1H (1)
10
PMDOUT2L (2)
PMDIN2L (2)
11
PMDOUT2H (3)
PMDIN2H (3)
PMD<7:0>
PMRD
PMWR
Master
PMCS
PMA<1:0>
Address Bus
Data Bus
Control Lines
Data Bus
Control Lines
PMRD
PMWR
PIC18F Slave
PMCS1
PMDOUT1L (0)
PMDOUT1H (1)
PMDOUT2L (2)
PMDOUT2H (3)
PMDIN1L (0)
PMDIN1H (1)
PMDIN2L (2)
PMDIN2H (3)
PMD<7:0>
Read
Address
Decode
Write
Address
Decode
PMA<1:0>