Global Peripheral Control Register - Motorola DragonBall MC9328MX1 Reference Manual

System Control
Table 8-3. Function Multiplexing Control Register Description (Continued)
Name
EXT_BR_EN External Bus Request Control—Chooses
Bit 2 whether the external bus request function is
masked or enabled.
Note:
and the EXT_BR_EN bit must be clear during
normal operation.
SDCS1_SEL SDRAM/SyncFlash Chip Select—Selects the
Bit 1 function of the CS3/CSD1 pin.
SDCS0_SEL SDRAM/SyncFlash Chip Select—Selects the
Bit 0 function of the CS2/CSD0 pin.

8.1.3 Global Peripheral Control Register

The Global Peripheral Control Register (GPCR) controls the driving force parameters of the bus and
several other functions in the MC9328MX1. Descriptions of the register settings appear in Table 8-4.
GPCR
BIT 31 30
TYPE r r
0 0
RESET
BIT 15 14
TYPE rw r
0 0
RESET
8-4
Description
The external bus request is a test signal
Global Peripheral Control Register
29 28 27 26 25
r r r r r
0 0 0 0 0
13 12 11 10 9
r rw rw rw rw
0 0 0 0 1
MC9328MX1 Reference Manual
0 = External bus request masked
1 = External bus request enabled
0 = CS3 selected
1 = CSD1 selected
0 = CS2 selected
1 = CSD0 selected
24 23 22 21 20
r r r r r
0 0 0 0 0
0x0000
8 7 6 5 4
rw rw rw rw rw
1 1 1 1 1
0x03FB
Settings
Addr
0x0021B80C
19 18 17 16
r r r r
0 0 0 0
3 2 1 0
r r rw rw
1 0 1 1
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