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Table 22-15. Motorola 68K/Intel 8080 Write Configuration (continued)
Register
Value
Comments
TIMCFG0
0x0000_2200
Configure enable on trigger high and
disable on compare. Timer output high
on enable.
TIMCTL0
0x01C3_1001 (Motorola 68K, 1-beat)
0x1DC3_1001 (Motorola 68K, 16-beats)
0x01C3_1081 (Intel 8080, 1-beat)
0x1DC3_1081 (Intel 8080, 16-beats)
Configure dual 8-bit counter using
FXIO_D[16] output (EN pin for 68K,
nWR pin for 8080), with Shifter 0 (1-
beat) or Shifter 7 (16-beats) flag as the
inverted trigger.
SHIFTBUF0...7
Data to transmit
Transmit data can be written to
SHIFTBUF0 (1-beat) or SHIFTBUF0...7
(16-beats) to initiate a transfer, use the
Shifter Status Flag to indicate when data
can be written using interrupt or DMA
request.
Table 22-16. Motorola 68K/Intel 8080 Read Configuration
Register
Value
Comments
SHIFTCFG0...6
0x000F_0100
Configure 16-bit parallel shift in from
adjacent shifter.
SHIFTCFG7
0x000F_0000
Configure 16-bit parallel shift in from pin.
SHIFTCTL0...7
0x0080_0001
Configure receive using Timer 0 on
negedge of clock with data input from
FXIO_D[15:0].
TIMCMP0
0x0000_0101 (1-beat)
0x0000_1F01 (16-beats)
Configure 1 or 16-beat transfer with
baud rate of divide by 4 of the FlexIO
clock. Set TIMCMP[15:8] = (number of
beats x 2) - 1. Set TIMCMP[7:0] = (baud
rate divider / 2) - 1.
TIMCFG0
0x0000_2220
Configure stop_bit, enable on trigger
high and disable on compare. Timer
output high on enable.
TIMCTL0
0x1DC3_1001 (Motorola 68K, 1 beat)
0x01C3_1001 (Motorola 68K, 16 beats)
0x1DC3_1181 (Intel 8080, 1 beat)
0x01C3_1181 (Intel 8080, 16 beats)
Configure dual 8-bit counter using either
FXIO_D[16] output (EN pin for 68K) or
FXIO_D[17] output (nRD pin for 8080),
with Shifter 7 flag (1-beat) or Shifter 0
flag (16-beats) as the inverted trigger.
SHIFTBUF0...7
Data received
Received data can be read from
SHIFTBUF0 (1-beat) or SHIFTBUF0...7
(16-beats), use the Shifter Status Flag to
indicate when data can be read using
interrupt or DMA request.
In general, any operation to a 68K/8080 bus slave will begin with a register write cycle
followed by one or more data read or write cycles. To accomplish this, the following
program flow should be used:
Application Information
K32 L2A Reference Manual, Rev. 2, 01/2020
588
NXP Semiconductors
Содержание K32 L2A Series
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