PSD4235G2V-10U STMICROELECTRONICS [STMicroelectronics], PSD4235G2V-10U Datasheet - Page 55

• Manufacturer Part Number: PSD4235G2V-10U
• Description: Flash In-System Programmable (ISP) Peripherals for 16-bit MCUs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

MMC2001
The Motorola MCORE MMC2001 MCU has a
MOD input pin that selects internal or external boot
ROM. The PSD can be configured as the external
flash boot ROM or as extension to the internal
ROM (see Figure 25, page 56).
The MMC2001 has a 16-bit external data bus and
20 address lines with external chip select signals.
The Chip Select Control Registers allow the user
to customize the bus interface and timing to fit the
individual system requirement. A typical interface
configuration to the PSD is shown in Figure 25,
page 56. The MMC2001’s R/W signal is connect-
ed to the CNTL0 pin, while EB0 and EB1 (enable
byte-0 and enable byte-1) are connected to the
CNTL1 (UDS) and CNTL2 (LDS) pins. The WEN
bit in the Chip Select Control Register should be
set to 1 to terminate the EB0-EB1 earlier to pro-
vide the write data hold time for the PSD. The
WSC and WWS bits in the Control Register are set
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
to wait states that meet the PSD access time re-
quirement.
Another option is to configure the EB0 and EB1 as
WRL and WRH signals. In this case, the PSD con-
trol setting will be: OE, WRL, WRH where OE is
the READ signal for the MMC2001.
C16x Family
The PSD supports Infineon’s C16X family of
MCUs (C161-C167) in both the multiplexed and
non-multiplexed bus configuration. In Figure 26,
page 57, the C167CR is shown connected to the
PSD in a multiplexed bus configuration. The con-
trol signals from the MCU are WR, RD, BHE and
ALE, and are routed to the corresponding PSD
pins.
The C167 has another control signal setting (RD,
WRL, WRH, ALE) which is also supported by the
PSD.
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