TMP92CF30
2009-06-15
92CF30-169
3.8.4
Controlling the Page Mode Access to ROM
This section describes page mode access operations to ROM and the required register settings.
The page mode operation to ROM is specified by PMEMCR.
(1)
Operations and register settings
The TMP92CF30 supports page mode accesses to ROM. Only the CS2 space can be
configured for this mode of access. The page mode operation to ROM is specified by the
Page ROM Control register, PMEMCR.
Setting the PMEMCR<OPGE> bit to 1 sets the mode of memory access to the CS2 space
to page mode.
The number of cycles required for a read cycle is specified by the
PMEMCR<OPWR1:OPWR0> bits.
PMEMCR<OPWR1:OPWR0>
<OPWR1>
<OPWR0>
Number of Cycles in Page Mode
0
0
1 cycle (n-1-1-1 mode) (n
≥
2)
0
1
2 cycles (n-2-2-2 mode) (n
≥
3)
1
0
3 cycles (n-3-3-3 mode) (n
≥
4)
1
1
4 cycles (n-4-4-4 mode) (n
≥
5)
Note: Specify the number of wait states (n) using the control register (BnCSL) for each address space.
The page size (the number of bytes) of ROM as seen from the CPU is determined by
PMEMCR<PR1:PR0>. When the specified page boundary is reached, the controller
terminates the page read operation. The first data of the next page is read in the normal
mode. Then, the following data is read again in page mode.
PMEMCR<PR1:PR0>
<PR1>
<PR0>
ROM Page Size
0 0
64
bytes
0 1
32
bytes
1
0
16 bytes (Default)
1 1
8
bytes
Figure 3.8.5 Page Mode Access Timing (when using a 16-byte page size)
A0~A23
2
CS
RD
D0~D31
+
0
+
4
+
8
+
12
Input
Data
Input
Data
Input
Data
Input
Data
t
AD3
t
AD2
t
AD2
t
AD2
t
HA
t
HR
t
RD3
t
HA
t
HA
t
HA
t
CYC
SDCLK
Содержание TLCS-900/H1 Series
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