III PERIPHERAL BLOCK: MONITORED MOBILE ACCESS INTERFACES
List of Pin Functions
Table 10.2 lists the five mobile access interface pin configurations specified by the MSEL pin input level and communications macro select (MCRS) register (D[1:0]/0x200000).
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| Table 10.2 Mobile Access Interface Pin Configurations |
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Pin Name | I/O | MSEL = Low |
| MSEL = High Communications Mode | |||
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| Serial IF Ch. 3 | UART |
| HDLC | PDC | PHS |
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| communications | communications | communications | communications | |
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| MCRS = (0, 0) | MCRS = (0, 0) |
| MCRS = (0, 1) | MCRS = (1, 0) | MCRS = (1, 1) |
DTR | O | DTR | DTR |
| MOPORT2 | MOPORT2 | MOPORT2 |
RTS | O | RTS | RTS |
| MOPORT3 | MOPORT3 | MOPORT3 |
TXD | O | SOUT3 | SOUT |
| TXD | PDCUPD | PHSUPD |
RI | I | RI | RI |
| MIPORT0 | MIPORT0 | MIPORT0 |
CTS | I | CTS | CTS |
| HDLCLK | PDCCLK | PHSCLK |
DCD | I | DCD | DCD |
| – | PDCFRM | PHSFRM |
DSR | I | DSR | DSR |
| MIPORT1 | MIPORT1 | MIPORT1 |
RXD | I | SIN3 | SIN |
| RXD | PDCDWD | PHSDWD |
CNT1 | O | CNT1 | CNT1 |
| CNT1 | CNT1 | CNT1 |
CNT2 | O | CNT2 | CNT2 |
| CNT2 | CNT2 | CNT2 |
GOUT | O | GOUT | GOUT |
| GOUT | GOUT | GOUT |
Note: Serial IF Ch. 3 requires both MSEL = Low and MCRS = (0, 0).
Basic Settings for Mobile Access Interfaces
Using the mobile access interfaces for communications requires the following basic settings.
Operating Clock
First use the CKD[3:0] bits in the communications block clock frequency divider register (D[3:0]/0x0200004) to specify the ratio for internally converting the PERICLK clock signal from the CPU core to a lower frequency (SCK) to conserve power. (See Table 10.3.) Specify the PERICLK frequency and then switch these bits to produce a frequency between 5 MHz and 10 MHz.
The default setting, after an initial reset, is 1111, which specifies the highest divider (16) for the slowest clock.
| Table 10.3 Clock Frequency Divider Settings | |||
CKD3 | CKD2 | CKD1 | CKD0 | SCK Clock Frequency Divider |
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| Settings |
1 | 1 | 1 | 1 | fout/16 |
1 | 1 | 1 | 0 | fout/15 |
1 | 1 | 0 | 1 | fout/14 |
1 | 1 | 0 | 0 | fout/13 |
1 | 0 | 1 | 1 | fout/12 |
1 | 0 | 1 | 0 | fout/11 |
1 | 0 | 0 | 1 | fout/10 |
1 | 0 | 0 | 0 | fout/9 |
0 | 1 | 1 | 1 | fout/8 |
0 | 1 | 1 | 0 | fout/7 |
0 | 1 | 0 | 1 | fout/6 |
0 | 1 | 0 | 0 | fout/5 |
0 | 0 | 1 | 1 | fout/4 |
0 | 0 | 1 | 0 | fout/3 |
0 | 0 | 0 | 1 | fout/2 |
0 | 0 | 0 | 0 | fout/2 |
fout = PERICLK output frequency
EPSON | S1C33210 FUNCTION PART |