Zilog Z80180 Manual de usuario Pagina 165

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Z8018x
Family MPU User Manual
150
UM005003-0703
After RESET, the CKS pin is configured as an external clock input (SS2,
SS1, SS0 = 1). Changing these values causes CKS to become an output pin
and the selected clock is output when transmit or receive operations are
enabled.
CSI/O Interrupts
The CSI/O interrupt request circuit is shown in Figure 58.
CSI/O Transmit/Receive Register (TRDR: 0BH)
Bit 76543210
Bit/Field CSI/O Transmit/Receive Data
R/W R/W
Reset 0
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Table 22. CSI/O Baud Rate Selection
SS2 SS1 SS0 Divide Ratio Baud Rate
000
¸ 20 (200000)
001
¸ 40 (100000)
010
¸ 80 (50000)
011
¸ 160 (25000)
100
¸ 320 (12500)
101
¸ 640 (6250)
110
¸ 1280 (3125)
1 1 1 External Clock input (less than
¸ 20)
Note: ( ) indicates the baud rate (BPS) at Phi = 4 MHz.
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