5 spi 1 test register, 6 spi 1 sample period control register, Spi 1 test register -10 – Motorola MC68VZ328 User Manual
Page 246: Pwm clock signals -2, Table 13-5, Spi 1 test register description -10
13-10
MC68VZ328 User’s Manual
SPI 1 Programming Model
13.3.5
SPI 1 Test Register
The configurable SPI test (SPITEST) register indicates the state machine status of SPI 1 as well as the
number of words currently in the TxFIFO and RxFIFO. The bit position assignments for this register are
shown in the following register display. The settings for this register are described in Table 13-5.
SPITEST
SPI 1 Test Register
0x(FF)FFF708
13.3.6
SPI 1 Sample Period Control Register
This register controls the time inserted between data transactions in master mode. The time inserted
between samples can be from 0 to about 1 second at the resolution of the data rate clock (SPICLK1) or the
CLK32 signal. Unless a different crystal is used, the CLK32 signal is 32.768 kHz. The bit position
assignments for this register are shown in the following register display. The settings for this register are
described in Table 13-6 on page 13-11.
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BIT
0
SSTATUS
RXCNT
TXCNT
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 13-5. SPI 1 Test Register Description
Name
Description
Setting
Reserved
Bits 15–12
Reserved
These bits are reserved and
should be set to 0.
SSTATUS
Bits 11–8
State Machine Status—This field indicates the state
machine status. These bits are used for test purposes only.
See description.
RXCNT
Bits 7–4
RxFIFO Counter—This field indicates the number of data
words in the RxFIFO.
0000 = RXFIFO is empty.
0001 = 1 data word in RXFIFO.
0010 = 2 data words in RXFIFO.
0011 = 3 data words in RXFIFO.
0100 = 4 data words in RXFIFO.
0101 = 5 data words in RXFIFO.
0110 = 6 data words in RXFIFO.
0111 = 7 data words in RXFIFO.
1000 = 8 data words in RXFIFO.
TXCNT
Bits 3–0
TxFIFO Counter—This field indicates the number of data
words in the TxFIFO.
0000 = TxFIFO is empty.
0001 = 1 data word in TxFIFO.
0010 = 2 data words in TxFIFO.
0011 = 3 data words in TxFIFO.
0100 = 4 data words in TxFIFO.
0101 = 5 data words in TxFIFO.
0110 = 6 data words in TxFIFO.
0111 = 7 data words in TxFIFO.
1000 = 8 data words in TxFIFO.