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5.7.2 Serial EEPROM for MSC8144 Boot
The serial EEPROM for the MSC8144 is the ST M24512. This device is an I
electrically erasable programmable 512 Kbit memory organized as 64 K × 8. The serial interface
supports a 400 KHz protocol. Its hardware write pin is controlled by the GPIO19 pin of the
MSC8144. A pull-up on the write control input protects the EEPROM device against undesirable
write operation. The device carries a built-in 4-bit Device Type Identifier code (1010) in
accordance with the I
MSC8144 boot function. Since the MSC8144 I
CPM module (bus port 2 of the host), the boot code may be prepared by the host software.
5.7.3 RTC
The device used for the real-time clock (RTC) is the Dallas DS1374. This device is controlled via
2
the I
C port 1 of the MPC8560 host processor at address 0x68. An on-chip oscillator circuit uses
a customer-supplied 32.768 kHz crystal to keep time. Square-wave output SQW is used to
generate the programmable square-wave signal used on the RTC input of the host. The output
default frequency is 32.768 kHz. Upon reset, the RST pin has a floating value.
5.7.4 Codec
The codec resides at address 0x70 on the I
is provided to program the registers of the TLV320AIC22C in situations where programming
them through the serial interface is not convenient. Below is summary info about the
TLV320AIC22C internal register functions:
„ Registers 1–5 and 15 are used to control codec 1.
„ Registers 6–10 and 16 are used to control codec 2.
„ Registers 11–14 and 17 are used to configure the device inputs, outputs, and clocking.
„ Register 21 is used for Device ID and preamp control.
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2
C bus definition. Chip Enable pins E0, E1, and E2 are grounded to provide
Figure 5-6. RTC Connection Diagram
2
C bus, port 2 of the host MPC8560. The I
MSC8144ADS MSC8144, Rev. 0
2
C bus is shared with the I
2
I
C Bus Interconnection
2
C-compatible
2
C bus of MPC8560
2
C interface
5-9
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