CP3BT23_14 Datasheet, PDF (29/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
www.ti.com
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
6.4.3 Static Zone 0 Configuration Register (SZCFG0)
The SZCFG0 register is a word-wide, read/write register that controls the timing and bus characteristics of
Zone 0 memory accesses. Zone 0 is used for the on-chip flash memory (including the boot area, program
memory, and data memory).
At reset, the register is initialized to 069Fh. The register format is shown below.
7
6
5
BW
WBR
RBE
4
3
HOLD
2
0
WAIT
15
12
11
10
9
8
Reserved
FRE
IPRE
IPST
Res.
WAIT The Memory Wait field specifies the number of TIW (internal wait state) clock cycles added for
each memory access, ranging from 000b for no additional TIW wait cycles to 111b for seven
additional TIW wait cycles. These bits are ignored if the SZCFG0.FRE bit is set.
HOLD The Memory Hold field specifies the number of Thold clock cycles used for each memory
access, ranging from 00b for no Thold cycles to 11b for three Thold clock cycles. These bits are
ignored if the SZCFG0.FRE bit is set.
RBE
The Read Burst Enable enables burst cycles on 16-bit reads from 8-bit bus width regions of the
address space. Because the flash program memory is required to be 16-bit bus width, the RBE
bit is a don’t care bit. This bit is ignored when the SZCFG0.FRE bit is set.
0 – Burst read disabled.
1 – Burst read enabled.
WBR
The Wait on Burst Read bit controls if a wait state is added on burst read transaction. This bit is
ignored, when SZCFG0.FRE bit is set or when SZCFG0.RBE is clear.
0 – No TBW on burst read cycles.
1 – One TBW on burst read cycles.
BW The Bus Width bit controls the bus width of the zone. The flash program memory must be
configured for 16-bit bus width.
0 – 8-bit bus width.
1 – 16-bit bus width (required).
FRE The Fast Read Enable bit controls whether fast read bus cycles are used. A fast read operation
takes one clock cycle. A normal read operation takes at least two clock cycles.
0 – Normal read cycles.
1 – Fast read cycles.
IPST
The Post Idle bit controls whether an idle cycle follows the current bus cycle, when the next bus
cycle accesses a different zone. No idle cycles are required for on-chip accesses.
0 – No idle cycle (recommended).
1 – Idle cycle inserted.
IPRE
The Preliminary Idle bit controls whether an idle cycle is inserted prior to the current bus cycle,
when the new bus cycle accesses a different zone. No idle cycles are required for onchip
accesses.
0 – No idle cycle (recommended).
1 – Idle cycle inserted.
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