UPSD33XX Datasheet, PDF (183/231 Pages) STMicroelectronics – Fast 8032 MCU with Programmable Logic

uPSD33xx
Port C Structure. Port C supports the following
operating modes on pins PC2, PC3, PC4, PC7:
■ MCU I/O Mode
■ GPLD Output Mode from Output Macrocells
MCELLBC2, MCELLBC3, MCELLBC4,
MCELLBC7
■ GPLD Input Mode to Input Macrocells IMCC2,
IMCC3, IMCC4, IMCC7
See Figure 76., page 184 for detail.
Port C pins can also be configured in PSDsoft for
other dedicated functions:
– Pins PC3 and PC4 support TSTAT and TERR
status indicators, to reduce the amount of time
required for JTAG ISP programming. These
two pins must be used together for this
function, adding to the four standard JTAG
signals. When TSTAT and TERR are used, it
is referred to as “6-pin JTAG”. PC3 and PC4
cannot be used for other functions if they are
used for 6-pin JTAG. See JTAG ISP and
JTAG Debug, page 195 for details.
– PC2 can be used as a voltage input (from
battery or other DC source) to backup the
contents of SRAM when V_DD is lost. This
function is specified in PSDsoft Express as
SRAM Standby Mode (battery
backup), page 193.
– PC3 can be used as an output to indicate
when a Flash memory program or erase
operation has completed. This is specified in
PSDsoft Express as Ready/Busy
(PC3), page 153.
– PC4 can be used as an output to indicate
when the SRAM has switched to backup
voltage (when V_DD is less than the battery
input voltage on PC2). This is specified in
PSDsoft Express as “Standby-On Indicator”
(see SRAM Standby Mode (battery
backup), page 193).
The remaining four pins (TDI, TDO, TCK, TMS) on
Port C are dedicated to the JTAG function and
cannot be used for any other function. See JTAG
ISP and JTAG Debug, page 195.
Port C also supports the Open Drain output drive
type options on pins PC2, PC3, PC4, and PC7 us-
ing the csiop Drive Select registers.
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